01Open source
Repos
Open-source repos worth knowing, by the problem they take on.
Data & Databases
TypeORM
TypeORM is a TypeScript and JavaScript ORM that runs across Node.js, browsers, and mobile/native platforms, supporting many SQL databases. It is widely used and notable for supporting more databases than any other JS/TS ORM.
DrawDB Editor
DrawDB is a browser-based database entity relationship diagram editor that can export/import SQL scripts and generate migrations. It is notable as an active, modern diagram tool with SQL generation and no account required.
Manticore Search
Manticore Search is an open-source search database supporting full-text, vector, and hybrid search with real-time indexing and SQL. It is notable for its speed and cost-efficiency, positioned as an Elasticsearch alternative with published benchmark advantages.
EF Core
Entity Framework Core is Microsoft's object-database mapper for .NET, supporting LINQ queries, change tracking, updates, and schema migrations across many databases via providers. It is the official .NET ORM and a major, substantive project.
ChartDB Visualizer
ChartDB is a web-based database diagram editor that imports a schema from a single query and can export SQL scripts or use AI for migration. It is notable for its single-query visualization and high momentum.
Directus CMS
Directus wraps any SQL database with REST and GraphQL APIs, a visual management studio, and an MCP server for AI agents. It has 45M+ downloads and is a flexible headless CMS/backend platform.
Kysely Query Builder
Kysely is a type-safe TypeScript SQL query builder with autocompletion, running on Node.js, Deno, Bun, Cloudflare Workers, and browsers. It is notable as a modern, well-regarded alternative to Knex.js for type-safe queries.
Game Dev
Flutter 3D Engine
An independent 3D engine and game engine built on Flutter GPU, demonstrated by three games; it is not a fork or binding and is unaffiliated with the Flutter team. It publishes 27 packages on pub.dev.
PicoGame Engine
A 2D game engine for the PicoPad handheld microcontroller running CircuitPython, with sprites, tilemaps, retained scenes, dirty-rectangle redraw, and blit effects implemented as a native C firmware module. It includes Python helpers and a desktop simulator.
Void Game Framework
A lightweight, modular 2D game framework for .NET that provides core systems while allowing developers to extend, replace, or ignore defaults. It intentionally omits full physics and UI frameworks, leaving them to chosen libraries.
Reference Asset Compiler
An open-source pipeline that converts a single concept image into a rigged, textured, animation-ready Unreal Engine 5 character using Hunyuan3D, Blender, and UE 5.8 verification. It includes a hash-bound approval ledger and supports rigging with or without Auto-Rig Pro.
Yandex Games Checker
An unofficial open-source pre-submission checker for Yandex Games, implemented as a single dependency-free debugcheck.js file that inspects SDK events, timings, ads, localization, and page behavior before moderation. PASS does not guarantee approval.
OpenHarness Platform
An open-source platform for running Claude Code, Codex and other coding agents across machines, with domain-specific tools and an optional open-hardware desk device. It targets technical founders building software, CAD, PCBs, robotics, and games.
Mini Game Workflow
A TypeScript monorepo for reusable WeChat mini-game development with Cocos Creator, providing shared client packages, an API server, admin web shell, and a ski sample game. It is an early 0.1.0 version suited for learning and architecture validation.
Robotics
Flybrain Robot Bridge
An experimental camera-to-robot bridge inspired by Drosophila vision, using optical flow and IMU feedback with a mock neural backend to send left/right UDP motor commands. It includes a local synthetic demo, with MaleCNS connectome integration planned.
MMBench2 World Models
Official code for 'Hallucination in World Models is Predictable and Preventable,' providing training/evaluation of generative world models plus hallucination predictors, targeted data collection, browser interaction, and 350M-parameter checkpoints.
Mobile Manipulator Stack
ROS 2 and Isaac Sim reference stack for a low-cost mobile manipulator with dual SO-101 arms, RGB-D camera, 2D LiDAR, and IMU. It integrates modeling, simulation, control, planning, perception, data QC, and imitation learning for practical hardware use.
Nav2 Tuning GUI
A ROS 2 GUI for tuning Nav2 navigation parameters on a live stack without restarting nodes; operators can adjust values such as max_vel_x and inflation_radius and see effects immediately.
Quackd Robot CLI
A CLI for connecting and commanding robots on LeRobot, AlohaMini, ToddlerBot, or ROS bases with LLM brains from Claude, OpenAI, Gemini, Grok, or local models; includes simulator, .duck safety contracts, MCP, memory, and flock coordination.
KERV VLA Models
Official code for the DAC 2026 paper 'KERV: Kinematic-Rectified Speculative Decoding for Embodied VLA Models.' It accelerates autoregressive vision-language-action models via speculative decoding that connects token-domain generation with kinematic-domain constraints.
FastCrest Tether CLI
FastCrest Tether is an open-source edge-to-cloud CLI for optimizing, verifying, and deploying VLA models across Jetson, RTX, Apple Silicon, and AMD. It certifies parity of ONNX exports against reference PyTorch policies (cosine +1.000000) on SmolVLA, pi0, pi0.5, and GR00T N1.6.
Science & Simulation
py-pde Solver
py-pde is a Python package for solving partial differential equations using finite differences on grids. It focuses on ease of use for exploring PDEs and supports numba, JAX, or PyTorch compilation for performance.
PathSim Simulation Framework
pathsim is a Python-native dynamical system simulation framework using a block diagram paradigm. It offers stiff solvers, event handling, and hierarchical models as a lightweight Simulink alternative.
GEOS-Chem Science Codebase
GEOS-Chem is the science codebase for the GEOS-Chem atmospheric chemistry model, containing routines, run scripts, and interfaces for multiple wrappers. It is a major Earth system science codebase used in global chemistry simulations.
SAMRAI Framework
SAMRAI is a C++ framework for developing block-structured adaptive mesh refinement applications. It targets large-scale parallel simulations with coupled physics and is notable as LLNL's scalable HPC AMR infrastructure.
MuJoCo Batch Runner
mjbatch is a Python library for running thousands of MuJoCo physics simulations in parallel on CPU using a C++ thread pool. It is useful for reinforcement learning and model predictive control requiring massive parallel rollout.
PyGMTSAR InSAR
PyGMTSAR provides Python-based satellite interferometry (InSAR) processing for Sentinel-1 and NISAR data. It is notable for making InSAR accessible and scalable, with a successor framework using Zarr version 3 for cloud-ready workflows.
Open Data Cube
datacube-core is the Open Data Cube core library for analyzing continental-scale Earth observation data over time. It provides a geospatial processing framework for managing and accessing large satellite data archives.
Security
ToolReplay AI Audit
ToolReplay audits AI agent tool-call transcripts for non-determinism, redundancy, and out-of-scope calls using hash-chain sealing and deterministic replay. It is a dependency-free Python CLI notable for its novel hash-chain audit approach.
MCP Pentesting Toolbelt
Blitz Strike is an MCP server that provides a structured penetration-testing methodology with reconnaissance, source-to-sink analysis, and live validation. It includes a 130-tool catalog and 57 escalation chains, notable for MCP-native pentest automation.
This Week's Movers
Security Audit Skill
A coding-agent skill that orchestrates isolated agents through multi-phase security audits, from reconnaissance to independently verified, machine-readable findings. It seeded Cloudflare's vulnerability discovery harness.
Trending Overall
Mac Image Editor
Free and open-source image editor for Mac built around Photoshop-like compositing workflow, with layers, masks, blend modes. Ambitious Photoshop alternative, early but promising, can modify via Xcode.
Agent Runtime Substrate
Runtime substrate that turns agent execution into reversible Git-like trace, allowing meta-agents to observe, fork, replay, revert runs. Copy-on-write fork ~5x faster than docker commit, ~95% KV-cache reuse on replay; early alpha for supervising/training agents.
Web & Frontend
WebGL Effects Library
VFX-JS is a JavaScript library that adds WebGL-powered shader effects to HTML elements like images and videos, with React bindings and prebuilt effects. It simplifies WebGL visual effects for frontend creative work.
JavaScript Library Creator
Rslib is a build tool for JavaScript and UI component libraries based on Rsbuild. It offers zero-config setup, semantic configurations, and integrated build/debug/document/test workflows; fresh from the rstack team.
Clojure Routing Library
Reitit is a fast, data-driven routing library for Clojure and ClojureScript. It provides bidirectional routing, route data, pluggable coercion, and conflict resolution; it is a solid, well-maintained choice for Clojure web apps.
MCP UI Framework
mcp-ui is an SDK for building interactive web UIs over the Model Context Protocol, with packages implementing the MCP Apps standard. It pioneered UI-over-MCP patterns that influenced the MCP Apps specification, making it notable for AI-frontend integration.
Angular Mocking Library
ng-mocks is an Angular testing library for mocking components, directives, pipes, and services, and simplifying TestBed setup. It is actively maintained and considered essential for Angular unit testing.
Django Template Components
django-components is a modular UI framework for Django that enables reusable template components, combining Django's templating with component patterns from Vue or React. It supports server-rendered frontend development across Django projects.
Trendyol Design System
Baklava is Trendyol's design system implemented as native web components, usable in Vue, React, Angular, or any framework via CDN. It provides a production-ready UI toolkit built with Lit for consistent user experiences.