Top DEVELOPMENT GitHub Repositories & Tools (2026)

Vibe code with pi in a lightweight, real IDE - The Vibe You Need

The full port of the SMBX engine from VB6 into C++ and SDL2, FreeImage and MixerX

Game engine for 2D and 3D projects with entity component system (ECS) and data-oriented design

Complete Unreal Engine development toolkit exposed as MCP tools.

The Open Source Test Automation Platform.

Spin up a complete internal developer platform with only Docker required as a dependency.

A nonlinear 2D puzzle platformer taking place in impossible spaces.

AI chat and agent tooling for Godot, with both MCP support and in-built native chat window.

Autonomous Engineering

Python's dir() for humans.

AI-assisted RAW photo developer: GPT vision advisor proposes an EditRecipe, a deterministic Rust engine renders it — Lightroom-compatible XMP sidecars, 24 RAW formats + baked images, measured (not guessed) Lightroom mask geometry, local GUI/web UI, AI denoise & segmentation sidecars

Spec-Driven Development for serious software developers. Spec Coding with with Claude, Cursor, Gemini, Codex. Kanban dashboard, git worktrees, auto-merge and more.

lsFusion is an extremely declarative open-source language-based platform for information systems development

Unity runtime for Rive

MCP server for reusable prompt templates, multi-step workflow chains, and quality gates. Compose agentic workflows with an operator syntax; export as native skills to Claude Code, Cursor, OpenCode, and Gemini CLI.

A scalable and efficient Runescape server targeting revision #377

WordPress framework for Laravel developers

Next generation open source Altinn platform and applications.

Agentic ✧ Gemma Inference for Android System Intelligence

Metis is a coding agent that boosts AI/LLM coding performance by 50%