Best open-source Developer Tools projects

Open-source API client that stores collections as plain-text files on your filesystem, an offline alternative to Postman and Insomnia.

Open-source low-code platform for building admin panels, internal tools and dashboards, connecting to 25+ databases and any API.

A fast, cross-platform terminal emulator that uses OpenGL for rendering, with sensible defaults and extensive TOML-based configuration.

A lightweight PowerShell script that removes preinstalled Windows apps, disables telemetry, and tweaks settings on Windows 10 and 11.

A Claude Code plugin that shows short replies by default, with phrases that expand in place when clicked.

A cross-platform command-line replacement for Xcode that builds, signs and installs iOS apps from SwiftPM packages on Linux, Windows and macOS.

Open-source API development ecosystem for building, sending and testing HTTP, GraphQL, WebSocket and other API requests, offered as web, desktop and CLI tools.

Native macOS app that creates software virtual displays so visual AI agents can work in desktop apps while physical monitors stay off.

A Python testing framework that makes it easy to write small tests and scales to complex functional testing of applications and libraries.

A unified web development toolchain that bundles Vite, Vitest, Oxlint, Oxfmt, Rolldown and task caching behind one `vp` command.

A native macOS menu bar remote for LG webOS TVs to launch apps, switch HDMI inputs, and use a touchpad-style pointer.

A uGUI-based in-game console for Unity that shows runtime logs and lets you run registered debug commands in builds.

A Unity extension that generates 2D navigation meshes from tilemaps, sprites and Collider2D shapes for pathfinding in top-down games.

An MIT-licensed Unreal Engine 5.8+ plugin that extends Unreal's native MCP server so AI agents like Claude Code and Cursor can drive the editor.

Swagger UI generates interactive API documentation in the browser from an OpenAPI specification file.

A JavaScript library that converts JS source code into SVG flowcharts, usable from the browser, Node.js, or the command line.

A terminal TUI for browsing, connecting to, and editing hosts in your ~/.ssh/config, with port forwarding and connectivity checks.

Batch and registry tools for Windows 10/11 that pause updates until 2051 and remove Recall, Copilot, telemetry and bloatware.

A terminal (TUI) download manager written in Go that splits files into parallel chunks and can run as a background server.

A keyboard-driven terminal UI (TUI) for connecting to and querying many SQL databases, inspired by lazygit.