Dev Utilities & Vibe-Coding Tooling

Open-source user platform bundling auth, teams, RBAC, API keys, payments, emails and webhooks behind client and server SDKs.

In-app feedback capture combining screenshots, video, voice notes and annotations into a single report.

World map overlaid with near-real-time infrared fire and thermal anomaly detections from multiple satellites.

Postgres-native workflow engine with an Edge Worker that runs durable, typed background job DAGs entirely inside a Supabase project.

Pairs a 2D map with a 3D rendered terrain model so photographs can be matched against mountain skylines.

Renders OpenStreetMap building data as an interactive 3D city map in the browser.

Community initiative and site cataloguing bloated npm packages, modern replacements, and cleanup guides for shrinking JavaScript dependency trees.

Rust CRDT library with WebAssembly bindings supporting rich text, movable tree structures and full version history for collaborative editing.

Type-safe regular expression builder that compiles away at build time, giving readable chained syntax and typed capture groups.

Unified plugin authoring layer so one plugin implementation runs across Vite, Rollup, Rolldown, webpack, esbuild and Rspack.

PDF utilities for Node, browsers and edge workers that extract text, metadata and page images from a serverless-safe PDF.js build.

Utility that expands a single base hex color into a full 50-900 shade ramp suitable for Tailwind or CSS variables.

CLI that exposes a local HTTP server to a public URL through Cloudflare Quick Tunnels without an account or config.

Programmatically edit JavaScript and TypeScript source files by mutating a proxied AST, preserving original formatting on write.

Fifty-eight browser-side utilities covering image editing, colour work, typography, PDF imposition, barcodes and conversion, with no accounts or tracking.

Dependency-free QR code generator that renders to SVG, Unicode or ANSI in any JavaScript runtime including edge workers.

Minimal documentation theme and CLI that turns a folder of markdown into a fast docs site with zero configuration.

Downloads templates and subdirectories from GitHub, GitLab or Bitbucket into a local folder, with caching and offline support.

Build plugin that generates metric-matched local fallback fonts automatically, eliminating layout shift while a webfont loads.

Markdown maintainer that regenerates blocks in your README from live data such as package metadata, file contents or badges.

Self-hosted image proxy built on sharp that resizes, crops and reformats images from URL path modifiers, with caching.

Offline developer workspace for code snippets, markdown notes, HTTP requests and sketches, stored as plain files with VS Code and Raycast integrations.

Open-source collection of developer utilities — encoders, converters, generators, network and crypto helpers — all running client-side.

Composable CLI builder with typed argument definitions, nested subcommands, auto-generated usage output and lazy command loading.

Sixty-three free browser tools spanning JSON formatting, image compression, favicon and flexbox generation, PGP and Tauri icon output.

Rolldown-powered bundler for TypeScript libraries that emits ESM, CJS and declaration files from a minimal config.

Free platform for viewing, analysing and downloading Sentinel satellite imagery with custom band combinations.

Release CLI that bumps package versions, updates the changelog, creates the git tag and pushes, with an interactive prompt.

Git-native API client for REST, GraphQL, gRPC and WebSocket that stores collections as plain text files in your repo.

Node.js runtime wrapper that executes TypeScript and ESM files directly with esbuild, including watch mode and REPL.

Go CLI and library that inlines CSS, JavaScript and images into one self-contained HTML file, with optional minification.

Library bringing haptic feedback to the mobile web using the vibration API with tuned patterns.

Dependency upgrade CLI that shows a per-package diff of available versions and applies bumps across every workspace at once.

Real-time animated line chart component for React designed for streaming data at high frequency.

Given a shadow length, date and time, maps every point on Earth where that shadow could occur.

Interactive visualiser of sun position, sunrise, sunset and shadow length for any location, date and time.

Open-source macOS screen recorder that exports GIF, MP4 and WebM with configurable frame rate, trimming and plugin export targets.

Modular schema validation library where every validator is a separate importable function, keeping tree-shaken bundles very small.

Postgres compiled to WebAssembly as a small embeddable library that runs a real database in the browser, Node or an edge worker.

Package manager shim that detects the lockfile and runs the right npm, yarn, pnpm or bun command from one short alias.

Simulates mountain, building and tree shadows anywhere on Earth for any date and time, rendered over a live map.

Visual regression runner that screenshots Storybook, Ladle, Histoire or page URLs in CI and reports pixel diffs on pull requests.

Schema-driven environment variable loader that validates values, documents them in .env files and detects secret leakage in builds.

Tiny runtime validator that parses and coerces environment variables against a schema and fails the process at boot with a readable report.

Fine-grained reactive state library with automatic persistence and sync plugins, designed to re-render only the components that changed.

Lightweight macOS clipboard manager with fuzzy search, pinned items, paste-without-formatting and rules for ignoring sensitive content.

SQLite virtual filesystem layer that fetches pages from cloud object storage, enabling sub-100ms queries against remote database files.

Functional building blocks for TypeScript: Option, Result, AsyncData and Future types with a fluent, non-academic API.

Rust CRDT implementation for collaborative plain-text editing optimised for extremely fast merging of long editing histories.

Minimal chromeless browser window built for recording clean screenshots and screencasts of web pages without any UI furniture.

Bundle analyzer that reads source maps to report true post-treeshaking, post-minification module sizes across Vite, Rollup, esbuild and webpack.

High-performance JSON CRDT, JSON Patch, JSON Pointer and binary codec toolkit for building collaborative document infrastructure.

Continuously benchmarks popular web frameworks on bundle size and runtime metrics and publishes the comparison as an open dataset.

VS Code extension that opens selected filenames as editable text so you rename many files with multi-cursor and find-replace.

Programmable ghost cursor for React that moves, clicks, types and scrolls against your live app, then exports itself as an animated SVG.

macOS window manager providing keyboard shortcuts and edge-snap areas for halves, quarters, thirds and maximise positions.

Node and WebAssembly bindings for the Rust resvg renderer, rasterising SVG to PNG with custom font loading and cropping.

Finds unused files, exports, dependencies and types across a TypeScript monorepo by resolving entry points from your real config files.

Exhaustive pattern matching for TypeScript with type narrowing, so unhandled union branches become compile errors instead of runtime bugs.

Result and ResultAsync types for TypeScript that force explicit error handling at call sites instead of thrown exceptions.

Fast standalone visual snapshot runner written in OCaml that drives headless Chrome from a simple YAML test definition.

macOS menu-bar utility that smooths mouse scrolling and sets scroll direction and speed independently per application.

macOS menu-bar app that controls external display brightness, contrast and volume over DDC as if they were built-in screens.

Chrome and Firefox extension converting any page to clean Markdown via Readability and Turndown, with copy-as-AI-prompt export.

Open-source SMS gateway turning a spare Android phone into an API endpoint, with dashboard, webhooks, bulk CSV send and self-hosting.

VS Code extension colouring CSV and TSV columns, aligning them, linting consistency and querying rows with an SQL-like language.

Automates product and documentation screenshots by letting you visually pick elements and regenerate images whenever the UI changes.

Generates visual dependency graphs of a module tree and detects circular dependencies, outputting SVG, DOT or JSON.

Dark syntax theme tuned for HTML, CSS, JavaScript and PHP, ported to VS Code, Sublime, Vim, iTerm and Chrome DevTools.

VS Code file icon theme built from IBM Carbon's icon set, giving a consistent monoline look across file types.

Embeddable database that runs in the browser with verifiable, content-addressed storage and pluggable cloud sync backends.

Managed and self-hostable Yjs sync server that persists documents to S3-compatible storage and scales sessions per document.

Community-maintained database mapping outdated or oversized npm packages to leaner, actively maintained modern equivalents with migration notes.

Transformer that compiles TypeScript types into optimised runtime validators, serializers and random generators with no schema declaration.

Reporter that draws every Playwright test and worker on an interactive timeline, exposing serialisation and slow-setup bottlenecks.

Collection of automated codemods that rewrite imports and call sites when swapping a legacy npm package for its recommended replacement.

Reactive in-memory data store with typed schemas, indexes, relationships, persistence adapters and optional CRDT-based synchronization.

Zero-config CLI that analyses TypeScript and JavaScript import graphs and prints circular dependency chains with the exact file paths involved.

SQLite extension that turns ordinary tables into conflict-free replicated ones, letting two databases merge changes without a central server.

Playwright fixture that records network responses to disk and replays them, making tests deterministic and dramatically faster.

Runtime string utilities whose return types are computed at the type level, so camelCase or split results stay literally typed.

Reads a live PostgreSQL schema and generates TypeScript interfaces, branded ID types and Zod schemas for every table and view.

Generates fully typed query functions from raw SQL files by introspecting the database, giving type-safe results without an ORM layer.

Self-hosted service that stores baselines, shows diffs and manages approvals, with SDKs for Playwright, Cypress and WebdriverIO.

Script and compose setup that provisions a hardened self-hosted Supabase stack with Caddy, TLS and authentication in one command.

GitHub Action that comments on pull requests with a detailed diff of added, removed and resized dependencies including install-size impact.

Query-driven sync engine that streams a subset of your Postgres data to the client and keeps reactive queries live with optimistic writes.

Extensible WebSocket backend for Yjs with pluggable persistence, authentication hooks, webhooks and horizontal scaling via Redis.

Set of React Query and SWR hooks that derive cache keys from Supabase queries and keep realtime updates in sync automatically.

Zero-dependency syntax highlighter using the CSS Custom Highlight API instead of span wrapping; ~2KB gzipped, 30+ languages, 10 themes.

Overlay that highlights which React components re-render and how expensive each render is, with no code changes or babel plugin.

Dev-server panel that shows each module's source after every Vite plugin transform, letting you step through the transform pipeline.

Toolkit around Drizzle ORM providing a schema visualizer, local playground and VS Code extension for exploring relations and migrations.

Implementation of type-prefixed, K-sortable UUIDv7 identifiers so IDs carry their entity type and sort chronologically.

Firefox extension replacing the tab strip with a vertical tree, where tabs opened from a page become collapsible children.

VS Code color theme with a muted, low-saturation palette and matching light variant, tuned for long editing sessions.

Command-line scanner that inspects a codebase and reports replaceable dependencies and legacy patterns worth modernising, with suggested alternatives.

Model Context Protocol server that lets AI coding agents query legacy-pattern and dependency-replacement advice while editing a repository.

Markup-based document system with instant preview, real scripting and readable errors, compiling to PDF, images or web pages.

Visual regression tool for Storybook that renders stories in Chrome, iOS simulator or Android emulator and diffs the results.

Browser workbench for chaining data operations: base64, XOR, AES, hashing, compression, hexdumps, X.509 and character-encoding conversions.

Playwright reporter that renders suites, cases and steps in a sortable data grid with attachments, trace links and code coverage.

Visual regression CI framework that stores baseline images in S3 or GCS and publishes an interactive HTML diff report per commit.

Self-hosted web app for scheduling, monitoring and restoring database backups across Postgres, MySQL, MongoDB, SQLite and more.

Static analysis tool that builds a dependency graph of a JS/TS project, finds cycles and unused files, and renders it in a browser UI.

Codemod CLI that strips unused variables, imports and parameters from source files while preserving surrounding formatting and comments.

Visual feedback tool letting you point at parts of a rendered UI and hand that context to a coding agent.

Event-sourced local-first data layer that keeps an in-memory SQLite read model derived from an append-only log of events.

Reactive client data layer with differential dataflow collections, typed live queries and optimistic mutations layered over any backend.

Visual review platform that stabilises screenshots, groups diffs per pull request and hosts Storybook and static build previews.

Draws an area on a map and estimates the maximum plausible crowd size within it at different densities.

Utility for capturing and framing clean screenshots of interfaces for documentation and marketing.

Crawls an entire site, runs Lighthouse on every discovered route in parallel and serves one searchable dashboard of the results.

IndexedDB-backed local-first framework with schema migrations, typed queries, undo history and a self-hostable sync server.

TypeScript framework for end-to-end typesafe APIs that also emit valid OpenAPI specs, with React, Vue and NestJS adapters.

Automated design review for AI-generated code, flagging accessibility and visual-quality issues in pull requests.

Predicts and visualises the current position and orbital path of more than ten thousand satellites.

Realtime relational database with an instant client SDK, offline support, permissions and optimistic updates on top of a Postgres backend.

Hosted TypeScript environment where each snippet deploys instantly to a URL, with built-in SQLite, blob storage, cron and email.

Declarative audio synthesis library for the web, letting you compose UI sound from primitives in JSX-like syntax.

Single CLI that pins language and tool versions per project, loads environment variables, and runs project tasks from one TOML file.

Open benchmark that ranks AI coding models by how much code their SWE-bench patches add, counting net syntax units instead of lines, with an upload-your-own-results chart.

Mac app (Windows preview) where you hit a hotkey, talk, click and draw over your screen or a plugged-in iPhone, then paste the keyframes and transcript into your coding agent.

Drop-in cargo replacement built on rust-analyzer and Cranelift that rebuilds only changed functions and hot-swaps edits into a running Rust program in milliseconds.

Opinionated Oxlint plugin with rules that reject AI-slop TypeScript patterns like chained type assertions, unknown parameters and ad hoc typeof narrowing.

Read-only TUI that has Claude Code, Codex, Gemini or OpenCode turn a git branch into a step-through tour of intent, risks, questions and verdicts.

Declarative terminal UI library for Lua inspired by SwiftUI, with state, VStack and HStack composition, modifiers, and a browser playground workshop.

Native Swift app that mounts private GitHub repos in the Finder sidebar like iCloud Drive, with files on demand, real git history and Git LFS.

Turns Claude Code, Codex and Mistral Vibe sessions into a live animated team call with characters, local voices, shared screens, sub-agent trees and replay.

Liquid Glass theme for iTerm2 and Ghostty on macOS and Linux, built from Apple system colors with four glass levels and contrast-checked light and dark palettes.

macOS CLI that turns an Icon Composer .icon or .appiconset into an Xcode-style blueprint version, with optional tinted RC or BETA badges for debug builds.

Privacy-friendly Windows/macOS desktop overlay that shows Codex quota, reset time, and reset credits beside the conversation title.

Experimental Apache-2.0 systems programming language with persistent semantic identities, checked graph projections, revision-bound patches, and bounded native and Wasm compiler lanes.

Type meaning (English or Chinese) inside Obsidian math blocks and get a full LaTeX template, offline, no AI or network.

Local real-time network traffic visualizer with a force graph, world map arcs, per-app attribution, tracker flags, and anomaly detection for scans or beaconing.

Markdown convention plus linter for AI-written project docs, catching stale versions and fields duplicated across files before agents read them back as context.

Open-source desktop inbox where coding agents pause for your decision on diffs, outgoing emails, or drafts, then continue with your feedback.

Native Rust database client built on Zed's GPUI, covering 20 databases with a GPU-rendered grid, command palette, and an AI that drafts queries into tabs.

Open-beta Cloudflare CLI generated from the full API OpenAPI surface, with JSON-first output, intent search, and TypeScript config for agents.

Local-first desktop app that tracks Claude Code and Codex tokens, cache hits, models, and cost across machines via a self-hosted hub.

Zero-dependency selective activation library that loads action modules on intent from server-rendered HTML without hydration.

Mouse-driven windowed desktop drawn in a terminal, running on ESP32 boards and as a native Windows or Linux app.

Small cross-platform code editor written in assembly with Vim mode, terminal panel, Git diffs, and optional agent side sessions.

Terminal world clock with a braille day-and-night map, per-city timelines, DST radar, exchange hours, and optional weather.

CLI that asks a repository what it does and returns relevant files plus verbatim source excerpts for coding agents via Jev.

Native multi-account sandbox manager for Google Antigravity that runs parallel isolated profiles on macOS and Windows with zero binary patching.

Open-source agent skill plus zero-dependency Node CLI that detects, plans, approves, and applies hosting, database, domain, email, and payments on your own accounts.

Read-only Go CLI that semantically checks source files against your rules using TypeSafe Jev, locally or in CI, without mutating the tree.

npm semantic code linter powered by Jev, with custom YAML rules, ranked issues, and setup hooks for Claude Code, Codex, and Cursor.

Dependency-free Python CLI that audits AI agent tool-call transcripts for non-determinism, redundant calls, and scope overreach.

Offline Swift CLI that inspects, documents, and scaffolds iOS projects with evidence-backed architecture checks and optional AI.

Tiny native macOS menu-bar tool that finds AI model hoards, kills orphaned vite and Next servers, and reclaims developer caches.

Local-first SQLite episodic memory so Claude Code, Cursor, Antigravity, and Codex share decisions across model switches on one project.

Obsidian's open-source template language that turns JSON data into Markdown via CLI or npm, with filters and Obsidian frontmatter helpers.

Fast Git-styled CLI that syncs files and folders with Google Drive, aimed at developers who want Drive without the GUI.

855-byte reactive DOM runtime that binds Proxy state to existing HTML with no components, templates, or virtual DOM.

Agent skill that proves accidental complexity before deleting it, tracking consumers, contracts, and verification so simplifications stay safe.

Streams MoE experts from SSD so a 125B 4-bit Qwen can run on Macs with far less RAM, via MLX/Swift with an Ollama-compatible API.

Local macOS voice loop for Claude Code and Codex: say hey Bol, dictate into the cursor, send it, and optionally hear talk-back summaries.

Zero-dependency CLI and MCP that compares a Next.js repo's claims to behavior: unused Prisma models, dead env vars, and locale drift.

Agentless Rust+Tauri desktop panel for Linux servers over SSH: live vitals, terminal, files, Docker, services, cron, users, and firewalls.

Clickable Kubernetes TUI in a single Go binary: instant search, logs, exec, port-forward, seven themes, and optional context-aware AI.

Free browser-based developer tools for JSON, APIs, OpenAPI, JWT/JWK, code formatting, data validation and DevOps checks.

macOS menu bar app that reads focused-window text through the accessibility API and appends it to daily markdown files for your agent to read.

Client-side fingerprint bench that runs every signal a site can read from your browser and rates how identifiable each one makes you.

Runs full VS Code inside a terminal by pairing code-server with a terminal-native browser; opens files, diffs and SSH targets from the shell.

LaTeX editor that compiles pdfTeX to PDF via WebAssembly in the browser, with local folder access, built-in git and offline package caching.

Decompiles Sierra SCI adventure games, abstract-interprets the scripts to find unwinnable states, then derives, verifies and compiles guard patches.

Native Mac terminal that classifies every session as needs-you, working, idle, finished or failed, and queues the ones awaiting a decision.

Curated discovery site for the Mac ecosystem — indie software, hardware, workspace setups, books and videos, filed by category.

Renders a real DOM styled with real CSS into terminal cells, giving TUIs browser-style layout, flexbox, text wrapping and coloured ANSI output.

Converts components between MUI, Chakra, Ant Design, Mantine, EUI, Bootstrap and Quasar using 219 hand-verified mappings, running entirely in the browser.

Vite-powered component workbench compatible with Component Story Format and controls, running as a single dependency and command.

Browser tool that detects GAN-generated faces by analysing facial landmark geometry.

Extension that lists every SVG on the current page and lets you preview, copy the markup or download each one individually.

Type-safe CLI framework with zero runtime dependencies where commands are classes and argument types flow into your handler.

Global interactive map of power lines, telecoms, solar, oil, gas and water infrastructure built on OSM data.

Framework and platform for deploying stateful realtime servers at the edge, one durable instance per room, with a simple WebSocket API.

Adds a click-to-source overlay so option-clicking an element in the browser opens the exact component line in your editor.

Simulates security camera fields of view, lens coverage and image detail over a map for geolocation work.

Email framework that renders JSX to client-safe HTML with twenty-plus components, a CSS-support checker CLI and live preview.

Browser extension giving design-tool style handles on any live page for spacing, typography, alignment and element inspection.

Local-first framework built on SQLite with end-to-end encryption, typed schemas and CRDT sync where the server never sees plaintext.

Full-stack database with a relational query engine that syncs to clients in realtime, offline support and optimistic updates built in.

Visual reference of regional traffic lights, utility poles, bollards, road markings and signage by country.

Extension that extracts colors, fonts, spacing and downloadable assets from a page into a clean panel instead of raw devtools.

Browser suite of image forensics tools including error level analysis, clone detection, noise and magnifier views.

Library of composable CRDTs from CMU research letting you build custom collaborative data types instead of using a fixed document model.

Web IDE for querying and visualising arbitrary OpenStreetMap data with instant map rendering of results.

Single interface for switching between several free satellite imagery and mapping providers at the same location.

Directory of real projects built on Supabase, filterable by stack and category, with links to live sites and source repositories.

Cross-browser visual testing tool for Storybook with an interactive UI for approving diffs and Docker-based browser grids.

Open-source Supabase starter providing teams, accounts, roles, billing hooks and row-level-security policies as ready-made SQL.

Composable dithered chart components for React using a Recharts-style children-as-config API.

Cross-platform text expander that replaces triggers with snippets, dates, shell command output and form-driven templates system-wide.

Extension for checking responsive layouts by rendering a page across multiple device widths simultaneously inside one browser tab.

Framework where collaborative, permissioned data structures sync themselves, with built-in auth, file handling and end-to-end encryption.