Development — no-sign-up tools

hoppscotch

hoppscotch.io

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

Development ★80k MIT

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drawDB

drawdb.app

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

Development ★38k AGPL-3.0

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RegExr

regexr.com

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

Development ★10k GPL-3.0

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Visual Studio Code for the Web

vscode.dev

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

Development ★188k MIT

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Algorithm Visualizer

algorithm-visualizer.org

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

Development ★49k MIT

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JSON Crack

jsoncrack.com

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

Development ★44k Apache-2.0

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IT-Tools

it-tools.tech

Collection of handy online tools for developers, with great UX

Development ★40k GPL-3.0

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carbon

carbon.now.sh

Create and share beautiful images of your source code

Development ★36k MIT

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Feather

feathericons.com

Simply beautiful open-source icons

Development ★26k MIT

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Simple Icons

simpleicons.org

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

Development ★25k CC0-1.0

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heroicons

heroicons.com

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

Development ★24k MIT

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Lucide

lucide.dev

Beautiful & consistent icon toolkit made by the community

Development ★23k ISC

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Tabler Icons

tabler.io

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

Development ★21k MIT

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ffmpeg.wasm

ffmpegwasm.netlify.app

FFmpeg for browser, powered by WebAssembly

Development ★18k MIT

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explainshell.com

Match command-line arguments to their help text

Development ★14k GPL-3.0

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Markmap

markmap.js.org

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

Development ★13k MIT

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QuickRef.ME

quickref.me

Share quick reference cheat sheet for developers

Development ★11k GPL-3.0

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Bundlephobia

bundlephobia.com

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

Development ★9.6k MIT

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Transform

transform.tools

A polyglot web converter

Development ★9.2k MIT

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Remix Icons

remixicon.com

Open source neutral style icon system

Development ★8.2k RIL-1.0

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Phosphor Icons

ionic.io

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

Development ★7.0k MIT

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Mermaid Live

mermaid.live

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

Development ★6.7k MIT

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AST explorer

astexplorer.net

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

Development ★6.5k MIT

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SVGOMG

jakearchibald.github.io

Shrink SVG sizes dramatically

Development ★6.2k MIT

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OpenMoji

openmoji.org

Open source emojis for designers, developers and everyone else!

Development ★4.5k CC-BY-SA-4.0

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Iconoir

iconoir.com

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

Development ★4.5k MIT

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JS Bin

jsbin.com

Collaborative JavaScript Debugging App

Development ★4.4k MIT

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Kroki

kroki.io

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

Development ★4.2k MIT

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CodeGraphContext (CGC)

cgc.codes

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

AI Development ★3.9k MIT

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CircuitJS1

falstad.com

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

Development ★2.3k GPL-2.0

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GitFut

gitfut.com

Your GitHub, rated out of 99 ⚽

Development ★2.1k MIT

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DartPad

dartpad.dev

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

Development ★1.9k BSD-3-Clause

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Online tools

emn178.github.io

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

Development ★1.2k

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Rom Patcher JS

marcrobledo.com

A ROM patcher made in Javascript

Development ★1.2k MIT

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KiCanvas

kicanvas.org

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

Development ★1.1k MIT

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Sqlime

sqlime.org

Online SQLite playground

Development ★1.1k MIT

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selfh.st Icons

selfh.st

Dashboard Icons provided by selfh.st

Development ★927 CC-BY-4.0

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delphitools

delphi.tools

A collection of small, low stakes and low effort tools

Development ★624 MIT

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CheckMyGit

checkmygit.com

Transform any GitHub profile into a stunning portfolio in seconds.

Development ★620 MIT

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Openhero

openhero.art

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

Development ★324 MIT

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ASM Editor

asm-editor.specy.app

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

Development ★310 AGPL-3.0

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Amicro

amicro.vercel.app

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

Development ★206

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Python Tutor

pythontutor.com

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

Development ★194 GPL-3.0

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Log Voyager

logvoyager.cc

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

Development ★117 MIT

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gists.sh

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

Development ★79

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ROOC Optimization

rooc.specy.app

A web platform for modelling and solving linear optimization problems

Development ★65 MPL-2.0

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Tokeko

tokeko.specy.app

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

Development ★27

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VeriSim

senolgulgonul.github.io

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

Development ★20 GPL-2.0

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