01Open source
Repos
Open-source repos worth knowing, by the problem they take on.
Data & Databases
libSQL Database
libSQL is an open-source fork of SQLite that adds embedded replicas, remote access, and WASM support. It is notable for its open-contribution model and as a novel embedded database.
Neo4j Graph Database
Neo4j is a high-performance graph database with ACID transactions and a flexible node-relationship model. It is widely adopted as the leading graph database, offering significant performance benefits over relational databases for connected data.
TiDB Database
TiDB is an open-source, cloud-native distributed SQL database with ACID transactions, HTAP, and vector search. It is notable for its high availability, horizontal scalability, and strong consistency.
QuestDB Time-Series Database
QuestDB is an open-source, high-performance time-series database that ingests millions of events per second and supports SQL for stream processing and analytics. It is notable for its zero-GC Java engine with C++ and Rust hot paths, SIMD, and JIT-compiled filters.
ArangoDB Multi-Model Database
ArangoDB is a native multi-model database supporting documents, graphs, and key-value data with a SQL-like query language and JavaScript extensions. It is notable for its integrated search engine and scalability for connected data.
Trino SQL Engine
Trino is a distributed SQL query engine for big data, formerly known as PrestoSQL. It is widely used for interactive analytics on large datasets.
PGlite Embeddable Postgres
PGlite is a WASM build of Postgres packaged as a TypeScript client library that runs in browsers, Node.js, Bun, and Deno without additional dependencies. It is notable for enabling reactive, real-time, local-first apps directly on Postgres.
Dev Tools & CLI
MobaRust Terminal
A free, open-source MobaXterm alternative built with Rust and Tauri, offering SSH, SFTP, SCP, terminals, tunnels, serial, Telnet, diagnostics, and remote administration. It is a local-first desktop client for developers, DevOps, sysadmins, and homelab users.
macOS System Data
A free macOS menu bar app that shows what is inside System Data and lets you delete items individually, explaining categories and showing commands before they run. Useful for developers with large System Data from simulators, caches, and logs.
Game Dev
Cordial Roblox Runtime
Open-source Roblox runtime for Linux that runs the Roblox client natively without Wine or an Android emulator, including a multi-instance launcher and GPL-3.0 licensing. It is a direct alternative to Sober, built via reverse engineering with an active compatibility layer.
OmniLua Rust Implementation
Pure-Rust Lua interpreter supporting versions 5.1 through 5.5, runnable as a CLI or embedded library, and compiles to WebAssembly. It requires no C dependency or unsafe FFI, making it suitable for game scripting and browser use.
GodotPrompter AI Framework
Agentic skills framework for Godot 4.x that supplies domain-specific expertise to AI coding agents such as Claude Code and Cursor. It extends the Superpowers plugin with Godot-specific knowledge, enabling AI-assisted game development in GDScript and C#.
Asobi Game Backend
Game backend platform built on Nova/OTP for solo devs and small teams building indie 2D multiplayer games. It provides matches, matchmaker, chat, leaderboards, economy, and other backend services, targeting turn-based and casual genres.
Avian Flight Model
6-DoF Flight Dynamics Model plugin for the Bevy engine and Avian physics, turning rigid-body hierarchies into physically plausible aircraft. It is a substantive physics library for flight simulation in Bevy.
LoreGUI Version Control
Cross-platform desktop and server GUI for Epic's Lore version control, offering staging, branching, merging, diffing, and file locking without a command line. It includes a built-in MCP server and is a community project under MIT license.
PrefabLens Unity Diff
Semantic diff tool for UnityYAML assets that shows changes to GameObjects, components, and fields. It is available as a Chrome extension for GitHub pull requests, a Unity Editor package, and a CLI.
Science & Simulation
GPU Array Library
ArrayFire is a general-purpose tensor library for parallel computing on CPUs, GPUs, and other accelerators, offering hundreds of functions in areas like linear algebra, machine learning, and signal processing. It is notable as an established GPU computing library for HPC and scientific workloads.
Python CUDA Integration
PyCUDA provides Pythonic access to NVIDIA CUDA with arrays and algorithms. It is notable as an essential CUDA integration for Python, widely used in GPU scientific computing.
R Data Transformation
collapse is a C/C++-based R package for fast data transformation and statistical computing with a class-agnostic architecture supporting many object types. It is notable for being highly optimized for scientific data analysis in R.
GPU Data Visualization
Datoviz is a Vulkan-based GPU visualization engine for interactive scientific data such as point clouds, images, meshes, and volumes. It is notable as a unique, high-performance, actively maintained tool for scientific rendering.
JavaScript Numerical Library
stdlib is a fundamental numerical library for JavaScript and TypeScript providing mathematical and statistical functions. It is notable for being a comprehensive, actively maintained library widely useful across scientific computing in JS/TS.
Universal Storage Engine
TileDB is an embeddable C++ storage engine for dense and sparse multi-dimensional arrays, dataframes, and key-value stores. It is notable as a universal array storage engine tailored for scientific and geospatial data.
Algebraic Multigrid Library
AMGCL is a header-only C++ library that solves large sparse linear systems using algebraic multigrid, usable as a standalone solver or preconditioner. It is notable as an exceptional, actively maintained black-box solver for PDE discretizations on unstructured grids.
Security
KeyCloak Exploit
This exploit for Keycloak CVE-2026-18963 lets an unauthenticated attacker set an arbitrary password on any account knowing only a username or email. It affects 26.0.0–26.7.1, fixed in 26.7.2, and is a valuable PoC for researchers.
Secret Exposure Tracker
RotationLedger reads a committed `git log -p` export offline, detects credential-shaped strings, and reports each secret's exposure days, introduction/removal commits, and HEAD presence. It is a fresh, focused credential hygiene CLI.
AI Red-Team Platform
REDCELL is an AI red-team platform where autonomous LLM agents run end-to-end penetration tests inside a Kali container and generate reports. It is a novel autonomous AI red-team tool with active development, using LangGraph and provider-agnostic models.
Host Container Security
MxCwpp is an open-source, enterprise-grade host and container security platform covering baselines, asset management, vulnerability scanning, antivirus, runtime detection, and compliance auditing. Its free Community Edition shares the internal architecture and targets security operations teams.
This Week's Movers
AI Memory Solution
ai-memory is a persistent long-term memory layer for AI coding CLIs, enabling handoff between agents like Claude Code and Codex without re-explaining architecture, failures, or open questions. It addresses cross-agent handoff pain.
GeoLibre GIS Platform
GeoLibre is a free, open-source, cloud-native GIS platform for geospatial visualization and analysis that runs in browsers, on desktop, mobile, and in Jupyter notebooks. It ships over 1,000 WebAssembly geoprocessing tools that run entirely in-browser, keeping data local.
Graft Coding Agent
Graft builds a living skill file and code graph that learns from each task, giving coding agents like Claude Code and Cursor codebase-specific context. Benchmarks report 46% fewer tool calls, 42% token savings, and a 12-point correctness gain.
OpenDisplay Second Monitor
OpenDisplay is a free, open-source self-hosted alternative to Sidecar and Duet that uses an iPhone, iPad, or spare Mac as a true extended monitor over USB or WiFi. It offers low-latency H.264, Retina HiDPI, and touch input.
Fastpotify Spotify Client
Fastpotify is a native Spotify client in Rust using egui and librespot, with local playback and Spotify Connect on Linux, macOS, and Windows. It uses 100–250 MB RAM and starts quickly versus the official app; playback requires Premium.
Utopia World Model
Utopia is DeepLethe's open-source enterprise knowledge system that stores evolving knowledge with time awareness and ontology, enabling conflict detection and reasoning. It is a Rust/Postgres temporal knowledge graph/world model; its 'world's first' claim is overstated.
Web & Frontend
Reagent React Interface
Reagent is a minimalistic ClojureScript interface to React, enabling efficient React components with plain ClojureScript functions. It is notable as a maintained, minimal wrapper for Clojure developers.
OpenFL Creative Library
OpenFL is an open-source creative library for web, desktop, mobile, and consoles, inspired by Flash and AIR APIs and built with Haxe. It is a legacy but maintained cross-platform tool.
Feature Sliced Design
Feature-Sliced Design is an architectural methodology for frontend projects, organizing code by layers, slices, and segments regardless of stack. It is notable as a documentation resource for frontend architecture.
Image to CSS
Img2css converts any image to pure CSS by recreating pixels as box-shadows on a single div, eliminating img tags. It is a clever but narrow utility.
PlayCanvas Editor
PlayCanvas Editor is a browser-based visual editor for building WebGL, WebGPU, and WebXR apps. It includes MCP integration for AI-assisted development, making it a solid tool for web graphics.
Onlook AI Designer
Onlook is an open-source AI-first visual editor for building and styling React apps directly on your codebase. It is notable for its AI design-to-code approach and strong momentum.
TinyVue UI Library
TinyVue is an enterprise Vue component library supporting Vue 2 and 3, PC and mobile, with 104 components, i18n, and theming. It is notable for headless/renderless support and a cross-framework architecture.