Best Open Source Developer Tools Projects

CSS preprocessor with variables and mixins

MailHog

Catch outgoing emails and inspect them in a web UI

High-performance component-based PHP framework

Unleash

Enterprise-ready feature flag and toggle management.

JavaScript library for vector graphics

Laravel-based CMS with a simple, modular design

JavaScript library for creating ZIP files

Uno Platform

Build native apps for Mobile, Desktop, and WebAssembly with C# and XAML.

Webstudio

Open source alternative to Webflow.

Convention-based PHP framework with rapid development tools

GrowthBook

Open-source feature flagging and A/B testing platform.

Woodpecker CI

A simple CI engine with great extensibility.

Web interface for MySQL and MariaDB administration

Database management in a single PHP file

Raycast Extensions

The community-maintained, MIT-licensed library of extensions that add integrations and commands to the Raycast launcher.

Supabase Realtime

Broadcast, presence and Postgres changes over WebSockets

Rowy

A low-code backend platform built for Firebase and Google Cloud.

Webhook.site

Instant URLs for testing webhooks and HTTP requests

IT asset management and service desk

Pure JavaScript CSS selector engine

Small, fast PHP framework with a minimal footprint

Remotely

A remote control and remote scripting solution, built with .NET 8, Blazor, and SignalR.

Appbase

Search UI components for Elasticsearch

Rivet

The open-source visual AI programming environment.