Development

Open-Source API Development Ecosystem. Alternative to Postman, Insomnia

Free, simple, and intuitive online database diagram editor and SQL generator

HTML/JS based tool for creating, testing, and learning about Regular Expressions

provides a free, zero-install Microsoft Visual Studio Code experience running entirely in your browser, allowing you to quickly and safely browse source code repositories and make lightweight code changes

An interactive online platform for visualizing algorithms from code and learning algorithm behavior through animations.

visualization application that transforms various data formats, such as JSON, YAML, XML and CSV into interactive graphs

Collection of handy online tools for developers, with great UX

Create and share beautiful images of your source code

Simply beautiful open-source icons

Free SVG icons for popular brands. 3000+ icons, public domain, no signup.

A set of free MIT-licensed high-quality SVG icons for UI development.

Beautiful & consistent icon toolkit made by the community

A set of over 6000 free MIT-licensed high-quality SVG icons for you to use in your web projects.

FFmpeg for browser, powered by WebAssembly

Match command-line arguments to their help text

Creates interactive mind maps from Markdown with a live editor and visualization

Share quick reference cheat sheet for developers

Find out the cost of adding a new frontend dependency to your project

A polyglot web converter

Open source neutral style icon system

The homepage of Phosphor Icons, a flexible icon family for everyone

Edit, preview and share mermaid charts/diagrams. New implementation of the live editor.

A web tool to explore the ASTs generated by various parsers.

Shrink SVG sizes dramatically

Open source emojis for designers, developers and everyone else!

An open source icons library with 1600+ icons, supporting React, React Native, Flutter, Vue, Figma, and Framer.

Collaborative JavaScript Debugging App

diagram rendering service that generates diagrams from text using tools like Mermaid, PlantUML, Graphviz, and more

An MCP server plus a CLI tool that indexes local code into a graph database to provide context to AI assistants

A browser-based electronic circuit simulator with animated schematics, example circuits, and editable components.

Your GitHub, rated out of 99 ⚽

An online Dart editor with support for console, web, and Flutter apps.

Online tools provides md2, md5, sha1, sha2, sha512, bas64, html encode / decode functions

A ROM patcher made in Javascript

An interactive browser-based viewer for KiCad schematics and PCB boards.

Online SQLite playground

Dashboard Icons provided by selfh.st

A collection of small, low stakes and low effort tools

Transform any GitHub profile into a stunning portfolio in seconds.

collection of cinematic video hero sections Browse, preview, copy & download production-ready backgrounds - instantly

A web editor to write, run and learn assembly code (X86, MIPS, RISC-V, M68K)

A curated library of premium React micro-interactions and transition components powered by Motion.

Visualize code execution step-by-step to better understand programming concepts and debugging.

Analyze huge log files (10GB+). Features JSON prettifier, regex filtering, and bookmarks.

GitHub Gists are the fastest way to share code, notes, and snippets. But they look terrible. This fixes that.

A web platform for modelling and solving linear optimization problems

An online creation tool for LALR and LR(1) parsers to learn how language theory works

Verilog simulator built by compiling Icarus Verilog to WebAssembly. No server, no install: edit, compile, simulate, view waveforms, and synthesize to a gate-level or RTL schematic

Run ffmpeg directly in your browser with a terminal-like interface.

A web app that enables you to search the Apple App Store in your browser and view app meta-data.

helps developers, especially beginners in open source, understand large repositories faster without getting lost trying to figure out where to start

Simple and modern web-based logic gate simulator

A free, browser-based tool for analyzing, querying, and repairing broken or oversized CSV files

Download Maven JAR dependencies and transitive dependencies as ZIP

Configuration builder/editor for opencode.

A huge, searchable collection of 200+ local-first developer tools for everyday text, data, and format tasks.

Get the highest resolution favicon for any domain or look up a service icon by name.

A visual cubic-bezier curve editor for crafting custom CSS easing functions