Bjarke Felbo

ping-warden. macOS menu bar app that eliminates AWDL latency spikes for cloud gaming, competitive play, and video calls. One-click AirDrop/AirPlay interference control. Signed, notarized, auto-updates.

instant. Instant is the best backend for AI-coded apps. You get auth, permissions, storage, presence, and streams — everything you need to ship apps your users will love.

canary. Tiny filesystem honeypot for macOS. Mounts fake secret files (.env, id_rsa, credentials.json) via WebDAV (no root) or NFS (root) — any access triggers an alert. Zero dependencies, pure Go stdlib.

sonar. CLI tool for inspecting and managing services listening on localhost ports

context-mode. Context window optimization for AI coding agents. Sandboxes tool output (98% reduction), persists session memory, and enforces routing across 17 platforms via MCP + hooks.

dash. TypeScript

tokenizer. HTTP proxy that injects 3rd party credentials into requests

velo. Postgres with instant branching and scale-to-zero

x402. A payments protocol for the internet. Built on HTTP.

tiny-imagenet. Python

ubicloud. Open source alternative to AWS. Elastic compute, block storage (non replicated), firewall and load balancer, managed Postgres, K8s, AI inference, and IAM services.

pipecat. Open Source framework for voice and multimodal conversational AI

bkmeans. The breathing k-means algorithm (just one source file containing the algorithm as found on pypi)

nanoGPT. The simplest, fastest repository for training/finetuning medium-sized GPTs.

scaling_laws. An open-source implementation of Scaling Laws for Neural Language Models using nanoGPT

pg-dump-parser. Parses PostgreSQL dump files into an array of schema objects.

pglite. Embeddable Postgres with real-time, reactive bindings.

kysely. A type-safe TypeScript SQL query builder

orioledb. OrioleDB – building a modern cloud-native storage engine (... and solving some PostgreSQL wicked problems)

typegres. PostgreSQL, expressed in TypeScript

capnweb. JavaScript/TypeScript-native, low-boilerplate, object-capability RPC system

pipecat-flows. Open source conversation framework for structured Pipecat dialogues

fastmcp. 🚀 The fast, Pythonic way to build MCP servers and clients.

vllm. A high-throughput and memory-efficient inference and serving engine for LLMs

open-r1. Fully open reproduction of DeepSeek-R1

storyteller-ai. A story generating game written for Rune

kap-cam. goodbye @loomhq, hello open source!

anthology-of-modern-ml. Collection of important articles to be treated as a textbook

WebGL-Fluid-Enhanced. WebGL Fluid Simulation for modern webpages (works even on mobile).

WebGL-Fluid-Simulation. Play with fluids in your browser (works even on mobile)

propel-js. Simple serialisable deterministic 2d physics engine

IPA. GUI analyzer for deep-diving into PDF files. Detect malicious payloads, understand object relationships, and extract key information for threat analysis.

glTF. glTF – Runtime 3D Asset Delivery

miniplex. A 👩‍💻 developer-friendly entity management system for 🕹 games and similarly demanding applications, based on 🛠 ECS architecture.

API. Documentation and Samples for the Official HN API

phy. Physics for three. Game engine

movex. Serverless Multiplayer Infrastructure for JavaScript Games. Private State | Real Time | Server Authoritative | Open Source

athena-crisis. Athena Crisis is a modern-retro turn-based tactical strategy game. Athena Crisis is open core technology.

worker. High performance Node.js/PostgreSQL job queue (also suitable for getting jobs generated by PostgreSQL triggers/functions out into a different work queue)

duckwars. Battleship, but with ducks! Made for the Rune platform

rune-dinodash. TypeScript

rune-flickfootie. TypeScript

LayaAir. LayaAir is a fully platform rendering engine with rich 2D/3D rendering capabilities and a mature integrated development platform

triplex. The open source visual workspace for React / Three Fiber. Build the 2D and 3D web. React Three Editor.

JoltPhysics.js. Port of JoltPhysics to JavaScript using emscripten

cooking-frenzy. 👨‍🍳 Cooking Frenzy • Mobile cooking game

JoltPhysics. A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.

mutative. Efficient immutable updates, 2-6x faster than naive handcrafted reducer, and more than 10x faster than Immer.

togl. Tiny Open Game Library

assemblyscript. A TypeScript-like language for WebAssembly.

react-native-orientation-locker. A react-native module that can listen on orientation changing of device, get current orientation, lock to preferred orientation.

floom. HTML

core-js. Standard Library

datachannel-native. C++ WebRTC Data Channels for mobile

libdatachannel. C/C++ WebRTC network library featuring Data Channels, Media Transport, and WebSockets

react-native-cronet. [Deprecated] This package allows you to use the Cronet for your react native apps.

nipplejs. :video_game: A virtual joystick for touch capable interfaces.

pytorch. Tensors and Dynamic neural networks in Python with strong GPU acceleration

node-datachannel. WebRTC For Node.js and Electron (including WebSocket Client & Server). libdatachannel node bindings.

bullet3. Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

geckos.io. 🦎 Real-time client/server communication over UDP using WebRTC and Node.js http://geckos.io

rune-dungeonsofglee. TypeScript

open-games. TypeScript

swordbattle.io. A multiplayer sword fighting IO game, now fully rewritten!

ArmorAlley. A browser-based interpretation of Armor Alley, a combat strategy game originally released in 1990 for the Macintosh and MS-DOS PCs.

caniemail. Can I email… Support tables for HTML and CSS in emails.

LiX. Compose papers, dissertations, textbooks, novels, newspapers etc. quicker using abstractions to the standard LaTeX document classes - or create your own classes easily.

react-game-jam-spooky-cookie. Spooky Cookie is a multiplayer game inspired by such classic hits as Pac-Man and Bomberman, but with a Halloween twist!

postgres-language-server. A Language Server for Postgres

react-three-fiber. 🇨🇭 A React renderer for Three.js

p5.js. p5.js is a client-side JS platform that empowers artists, designers, students, and anyone to learn to code and express themselves creatively on the web. It is based on the core principles of Processing. Looking for p5.js 2.0? http://beta.p5js.org

tremor-npm. React components to build charts and dashboards

faiss-node. Node.js bindings for faiss

cuberun. A small 3D game built with react-three-fiber

dataplaneapi. HAProxy Data Plane API

haproxy. HAProxy Load Balancer's development branch (mirror of git.haproxy.org)

thumbhash. A very compact representation of an image placeholder

cocos-engine. Cocos simplifies game creation and distribution with Cocos Creator, a free, open-source, cross-platform game engine. Empowering millions of developers to create high-performance, engaging 2D/3D games and instant web entertainment.

react-native-webview. React Native Cross-Platform WebView

mathesar. An intuitive spreadsheet-like interface that lets users of all technical skill levels view, edit, query, and collaborate on Postgres data directly. 100% open source and self hosted, with native Postgres access control.

awsets. A utility for crawling an AWS account and exporting all its resources for further analysis.

pg_ivm. IVM (Incremental View Maintenance) implementation as a PostgreSQL extension

engine. Powerful web graphics runtime built on WebGL, WebGPU, WebXR and glTF

pulumi. Pulumi - Infrastructure as Code in any programming language 🚀

codereview.gpt. Reviews your Pull/Merge Requests using ChatGPT

THNK. An authoritative multiplayer games framework for GDevelop.

prql. PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement

d2-erd-from-postgres. Create a D2 ERD Diagram from your existing postgres schema

d2. D2 is a modern diagram scripting language that turns text to diagrams.

just. the only javascript runtime to hit no.1 on techempower :fire:

Counter-Strike-JS. Counter Strike implementation with Javascript/Typescript

treefun. A tree diagram (SVG) generator.

workerd. The JavaScript / Wasm runtime that powers Cloudflare Workers

isolated-vm. Secure & isolated JS environments for nodejs

purecheck. Static analysis of JS code to identify non-pure functions

olm-datasets. Pipeline for pulling and processing online language model pretraining data from the web

react-native-firebase. 🔥 A well-tested feature-rich modular Firebase implementation for React Native. Supports both iOS & Android platforms for all Firebase services.

cowboy. Small, fast, modern HTTP server for Erlang/OTP.

bun. Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one

remotion. 🎥 Make videos programmatically with React