Projects from HN posts

What are folks working on?

1689 projects published

Options market-making system

An options market-making trading system built around a custom volatility model trained on historical data. It runs a passive delta-hedged market maker, renders a synthetic underlying price from multiple market data sources, and operates across a handful of high-performance servers, with development done through Claude Code sessions.

Builders @zopf

AI & automationBusiness & finance

3D spatial data capture and sharing service

This service captures, views, and shares 3D spatial data. It supports ARKit and Apple LiDAR, letting users perform room scans within seconds and stream 3D video in real time, viewable on the web via WebRTC and WebGPU. The plan is to let any tracked camera relocalize against the same coordinate frame and share spatially-anchored data, enabling across-ecosystem interoperation of spatial computing systems — for example scanning a home to guide a domestic robot, viewing IoT sensor data in a 3D map, or sharing the same AR experience across Android and iPhone with a remote viewer guiding from a birds-eye view in a phone browser.

Builders @Klsimek

Developer toolsInfrastructure & hosting

ankix

CLI tool that turns YouTube/podcast transcripts, Kindle highlights, and other text into 'glossed' (contextually translated) Anki flashcards using a local Ollama model.

Builders @basetensucks

AI & automationEducation

summond

Developer- and agent-friendly tool for interacting with macOS Launch Control. It aims to support all relevant Launch Control triggers via a TOML config format, with dynamic environment control, logs, and dotfile-friendly configuration.

Builders @basetensucks

Developer toolsInfrastructure & hosting

Chobble Tickets

Open source event ticket sales platform licensed under AGPLv3 that runs on Deno edge script hosts like Bunny CDN, making it very affordable (around $1/month) and simple to self-host. It has no branding requirements and supports connecting your own domain. It is operated as a UK Community Interest Company with an asset lock so the product cannot be sold off. Six months into development, it hosts about 50 sites (charged at £5/month) and has processed a few thousand bookings.

Builders @chobbledotcom

Business & finance

PulpitBase

A platform for watching and sharing sermons, with an integrated Bible reader that supports basic study of scripture.

Builders @jngbtmbwc

Creative tools & mediaEducation

Agent Circus

AI sandbox framework for running AI agents, supporting execution of agents in Podman containers and independently updating agent harness versions without updating the CLI tool. Planned roadmap work includes a plugin system that clearly separates the framework core from pluggable extensions, where plugins bundle settings such as container image build commands, startup commands, and information forwarded from the host into agents' containers (environment variables, networking settings, etc.).

Builders @rpoisel

AI & automationDeveloper tools

top3.best

A recommendation app that asks 10+ AI models for their top options for whatever the user is looking for, pools the results, and returns the overall top three. It was also built to explore which areas have model consensus versus diversity of opinion.

Builders @io84

AI & automation

Arbiter

A deterministic judgement engine for disagreeing inputs, built on research into conflict logics. Its input interface is currently shaped for LLMs and it also exposes a normal API; planned next steps include an ingest pipeline and a more sophisticated logic engine.

Builders @pnathan

AI & automationDeveloper tools

Intrasti

A passion-project website directory that indexes websites organized by topics. A redesign is underway to rebalance the focus between websites and topics — currently topics dominate — replacing the live 'shelves' approach with a new 'topic card' UI. The build uses only the web platform (no Tailwind or CSS frameworks), relying on child combinators for maintainable CSS, and the codebase was recently reorganized from a domain-driven structure to a flat, horizontally layered layout.

Builders @JeremyJaydan

Community & civic

Squares-in-circle packing (n = 31 and n = 34)

This project provides improved solutions for packing squares inside a circle for n = 31 and n = 34 squares, with code and results published on GitHub alongside Erich Friedman's known packing references.

Builders @dllu

Science & research

viboceros (vibe coded CAD application)

This is a CAD application built via vibe coding (AI-assisted development), currently paused because of quota limits on a $200/month plan; its ambition is to produce a correct B-rep kernel.

Builders @dllu

Creative tools & media

Ray traced chess demo

This is a chess demo rendered with ray tracing, published on GitHub.

Builders @dllu

Creative tools & mediaGames

Fields of Color

A 501(c)(3) nonprofit based in Atlanta, Georgia that showcases and highlights relatively unknown but talented artists from other countries; it has completed a visa application to bring one of the featured artists to the US.

Builders @neuralkoi

Community & civicCreative tools & media

vibeworld

A terminal-based cyberpunk multiplayer shared persistent world accessed by typing "vibeworld" in the terminal. It features themed continents (physics, computer science, etc.) with cyberpunk cities where users can create, expand, and enter chatroom "corners" with text and voice chat, create avatars and optionally share their GitHub, and visit a moon with a pixelated starry sky, a communal plant that dies unless someone waters it, chill low-quality music, and a spot to "scream" about LLM sessions visible to everyone from space. Meant to be left open on a second monitor while working, letting developers and scientists casually meet and chat while working late. Runs on Linux, macOS, and Windows.

Builders @sorbalda

Community & civicGames

Nucleus programming language

A self-hosted systems programming language that combines Lisp syntax and structural macros with C semantics. Features include strong typing, protocols similar to Clojure or Rust traits, non-nullable references, error values, bound error handlers like Common Lisp, optional lexical lifetimes, namespaces, and no mandatory runtime overhead relative to C.

Builders @Zak

Developer tools

Oxid DB

A database that combines probabilistic and deterministic reasoning into a single source of truth for AI agents and larger systems, built on a neurosymbolic approach and intended to be released as open source.

Builders @VincentBrand

AI & automationData & analytics

throwdown.top

A free web app for creating leaderboards for club CrossFit competitions. It offers a simple set of forms and tables without feature overload, with an emphasis on comfortable UX, and has been battle-tested at real club events.

Builders @cookienaut

Community & civicHealth & fitness

Abeam

Open-source app for Apple platforms that turns a TV-connected Mac into a casting target: it plays YouTube videos on the Mac and mirrors a Mac or iPhone screen to it. Sender devices need macOS 26 or iOS 27, while the TV-connected Mac can run macOS 13 or later, making it a way to repurpose older laptops as TV receivers. The apps are currently in app review.

Builders @xwes

Creative tools & media

SO-101 ARM robotics handling

A robotics handling project built around the SO-101 robot arm; the author notes that options for getting into robotics are more expensive and less varied than expected.

Builders @lurker919

Hardware & DIY

Distributed operating system for ML resources

A distributed operating system for managing machine learning resources, coordinating the entire memory hierarchy, networking, and compute hierarchy. The project explores upcycling end-of-life NVIDIA GPUs (K80, M40, P100), offloading MoE expert calculations to MCUs with NPUs and possibly FPGAs, and managing a 10G LAN-attached network of older Xeon servers with GPUs and USB-attached MCUs as a machine learning fabric. It also investigates bypassing end-of-life CUDA driver support for older NVIDIA hardware using Rust/Vulkan and applying ideas from IBM's ACP/TPF operating system and Workload Manager, plus architectures like Freetoken (MoE caching/routing, Engram, KV-cache compression) and other efficient-modeling approaches.

Builders @softwarewright

AI & automationHardware & DIYInfrastructure & hosting

FitBee

A fast, ad-free, no-nonsense calorie and macro tracker for iPhone, iPad, and Apple Watch, built with Swift and SwiftUI on the client and a Python backend.

Builders @yqiang

Health & fitness

OpenPaint

A simple MS Paint-like cross-platform image editor for Mac, Linux, and Windows, revived as version 2.0 after 17 years. It stays faithful to the original Paint experience while adding quality-of-life improvements such as multiple tabs with image previews, cross-platform support, and a cleaned-up modernization of the old wxWidgets-based codebase.

Builders @murdockq

Creative tools & media

Gymnastic rings calisthenics training

A multi-year personal calisthenics training practice focused on building strength and gymnastic skills using gymnastic rings.

Builders @cekanoni

Health & fitness

raggy

A simple CLI tool that performs retrieval-augmented generation (RAG) over the user's local documents.

Builders @paulknysh

AI & automationDeveloper tools

adsb.win

A game-style site that turns feeding ADS-B aircraft data into a game, aimed at aviation enthusiasts who run ADS-B receivers.

Builders @mfkp

GamesHardware & DIY

notespace

Forum software designed to stay inside Cloudflare's free plan (Workers, D1, R2) for hosting small forums of a couple hundred users, with AI-powered moderation. Written mostly in Rust as Cloudflare Workers WASM, it can also self-host as a single binary with SQLite, released under the MIT license.

Builders @kbaker

AI & automationCommunity & civic

GradCast

A proof-of-concept web application that helps students simulate their financial future after graduation, connecting degree-level earnings to local rent, federal/state taxes, and student loan amortization to show real monthly take-home. It is built on the U.S. Department of Education's College Scorecard API and HUD Fair Market Rent data, using underutilized government and free data sources to aid college and career decisions with realistic future budget forecasting.

Builders @knowthankyew

Business & financeEducation

vision3d

An open-source library that extends the torchvision API to 3D object detection tasks. It provides semantic tensor types (point clouds, images, bounding boxes) built on torchvision's TVTensor, transforms that verify geometric consistency when composed, dataloaders, 3D object detection metrics, and optional visualization utilities, aiming for interoperability with torchvision image transforms. Under the hood it uses the Torch Stable ABI for custom CUDA/C++ extensions so a single wheel works across PyTorch >= 2.10, and statically links the CUDA runtime so it works out of the box on hosts with CUDA >= 12.8. Work is underway to support static tensor shape type checking via Pyrefly.

Builders @yeetypete

AI & automationDeveloper tools

MiSTerFin Go port

A Go port of MiSTerFin, a Jellyfin client for the MiSTer FPGA, designed to play Jellyfin media on a CRT. The port rewrites the original C client in Go where appropriate and focuses on making improvements, smoothing out rough edges, and adding features to deliver a great Jellyfin player on a 4:3 CRT, with publication planned for others who might be interested.

Builders @trentnix

Creative tools & media