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Projects from HN posts

What are folks working on?

1689 projects published

Bonsai

A voxel game engine under development for ~10 years. The world and objects in it are represented as SDF (density) fields, and the world generator and editor operate almost entirely on the GPU via a fused three-stage 'ubershader' pipeline: a user-configurable GLSL 'shaping' shader, a fused stage that convolves normals, runs a user-configurable 'decoration' function, and interprets SDF edits compiled from a graph into bytecode, and a final stage that packs occupancy, color, and normal into 32 bits. GPU results are passed back to the CPU for entity/structure spawning callbacks, then chunks are meshed with a fast binary algorithm and uploaded, retaining 16 bits per surface voxel and scaling to world sizes greater than 1B voxels cubed. The engine aims to give users both easy-to-use tools and granular control over the final output, while remaining fast.

Builders @jesse__

Developer toolsGames

poof

A language/code repository shared by the author of the Bonsai voxel game engine, linked alongside the engine for anyone interested in looking at the language code.

Builders @jesse__

Developer tools

Pixel Edit Lite

A minimalistic sprite editor app for the pico8 fantasy console, letting users create pixel sprites with a simple, pared-down UI. First published in 2023 and recently updated, with plans to add sprite animation support next while keeping the interface minimal.

Builders @code_devil

Creative tools & mediaGames

MinPin

The MinPin platform is a reusable framework for selling self-hosted services from a home server rack, with offerings including IPFS pinning, photo storage and backup with Immich, monitoring and alerting with a status page, and personalized browser history search with Hister. All apps support single sign-on against the identity provider so switching between them is seamless, and billing is unified: a single subscription ($5/month for one app, $8/month for four or more) grants access to multiple applications and is billed as one Stripe charge so the fixed transaction fee is paid once rather than per app. It was built with Claude Code.

Builders @linuxguy2

Business & financeInfrastructure & hosting

Lexicon

A vocabulary builder built around fun word puzzles, offering eight games including a daily challenge and original games like Cascade and Flipside. All games draw from a curated collection of words and definitions, and players can save interesting or useful words to their personal Lexicon to revisit meanings, example sentences, synonyms and antonyms later.

Builders @HamishGosling

EducationGames

Native Win32 Steam Frontend

This app is a native Win32 frontend for the Steam client, built with Claude's help as a lightweight alternative to the latest Steam client, which is a Chromium Embedded Framework that runs at all times. It is (dubiously) portable and will be used to run the author's flight simulator.

Builders @GaryBluto

Games

Habitnex

An iPhone AI habit coach that uses the user's calendar to help fit habits into their day.

Builders @habitnex

AI & automationProductivity

hn.fiodorov.es

An agentic search tool that searches across Hacker News comments using AI agents.

Builders @afiodorov

AI & automationData & analytics

climate.fiodorov.es

A climate agent that provides access to climatic data for many cities.

Builders @afiodorov

AI & automationData & analytics

lyrics.fiodorov.es

A tool to search and translate song lyrics using an LLM.

Builders @afiodorov

AI & automationCreative tools & media

Teilifís Seán (Jellyfin plugin)

A Jellyfin plugin that toggles Jellyfin between a Netflix-style presentation and an old school TV channel surfing mode at the click of a button, and back again. It makes Jellyfin more fun by removing the complicated decision of what to watch — when unsure, the user clicks the Teilifís Seán button.

Builders @s_dev

Creative tools & media

Janus

This app is a notebook for interview preparation: it records interview conversations, provides useful feedback on them, and helps users prepare for their next interview round.

Builders @kcirtapfrmspc

EducationProductivity

Mooring (macOS RDP client)

A macOS RDP (Remote Desktop Protocol) client that improves on the native macOS tooling, adding retina full screen scaling, automatic reconnection, and network measurement that downgrades connection quality when necessary.

Builders @kcirtapfrmspc

Infrastructure & hostingProductivity

GitWarren

This is a free and open source, local GitHub-like code review app (GitWarren) for comfortably reviewing code written by AI agents before the code ever leaves the user's computer. Once installed, the agent sends the user a GitWarren link each time it finishes a piece of work for review, replicating the GitHub code-review experience. It runs as a local WebUI or desktop app, and works with tailnet and SSH for reviewing code on remote machines, including mobile reviews from a phone on the tailnet.

Builders @xfor

Developer tools

Reversible incremental sorting algorithm

A sorting algorithm for scenarios where the cost of comparisons is high and heterogeneous, intended as a methodology for minimizing the number of pairwise human evaluations (e.g., in AI, marketing, search evaluation, and clinical trials). It tracks which pairs are solidly established, which parts of the ranking remain ambiguous, and which alternatives are still possible/impactful, deducing the fraction of the sorting that can be reused during updates — reversible incremental ranking with information-theoretic guarantees and updates that scale linearly with the number of items. It also has a machine learning application as differentiable sorting and ranking, with reported performance of 27ms and 0.18MB for sorting 8,000 items versus 1.9s and 488MB for softsort, and about 100ms and 15MB for 10^6 items, running in O(n log n) time and O(n) space like fastsoftsort while allowing linear-time ranking updates on subsequent runs.

Builders @Xmd5a

AI & automationData & analytics

Aevo

This app is a todos and notes web app with a new take on task management: every task can have nested subtasks layered as deep as the user wants, and a grouping feature helps surface what is really important right now and how big a task is. Tasks support notes, links, and files, and a Mac app is available; it is in active development and used daily for work.

Builders @KlyX

Productivity

Fala Gringo

A free, open source, flashcard-based language-learning tool for teaching Brazilian Portuguese, focused on verb and vocabulary drilling where the learner sees English and produces the Portuguese. Includes a "Foco" mode that smartly selects which flashcards to drill each day. The site is fully static with no build step, works on all platforms and browsers without installation, and offers optional account-less cross-device progress sync through a tiny worker keyed by a sync code.

Builders @henrikhestnes

Education

Eigakan Guide ChatGPT plugin

A ChatGPT plugin in development that will allow users to search Japanese cinema showtimes (via Eigakan Guide) through ChatGPT using natural language queries.

Builders @m007850

AI & automationLifestyle & hobbies

Voiden

Voiden is an open-source API IDE that is being extended with an MCP (Model Context Protocol) integration. The new capability lets AI test APIs and create MCPs, effectively going headless.

Builders @nikolasdimi

AI & automationDeveloper tools

Fillvisa

An open-source immigration legaltech platform built as an alternative to closed-source immigration software like Docketwise, aiming to bring open-source options to the legaltech space.

Builders @junaid_97

AI & automationBusiness & financeProductivity

Browser-based Shenmue MMO experience

A browser-based MMO experience for the 1999 Dreamcast game Shenmue, playable on the web. It is still rough around the edges but has been well received by fans of the original game.

Builders @brynnb

Games

TerraSunder

TerraSunder is a browser-based client for the MMOFPS Planetside, close to completion. It includes a settings option for players to submit performance reports to help track down performance issues.

Builders @brynnb

Games

Rust website monitoring service

A website monitoring service written in Rust. The checking engine was ported from the reqwest HTTP library to libcurl to properly capture DNS, connect, TLS, and first-byte timing breakdowns. The new engine was validated side by side with the original for weeks at 100k+ daily checks, reaching 99.8% agreement, with mismatches including Cloudflare challenges that returned 403 responses based on the HTTP/2 fingerprint regardless of user-agent.

Builders @pupskipper

Developer toolsInfrastructure & hosting

Laboratory.love

This project tests consumer products for plastic chemicals and publishes the results to make supply chains transparent. It lets people kick off crowdfunding pages to have regularly consumed products tested, and shows what has been tested so far on its results page.

Builders @cjflog

Health & fitnessScience & research

NotesPlus

A free note-taking app for macOS (Silicon and Intel) and Windows that stores every note as a local Markdown file. It supports tags and priorities, renders many scientific syntaxes (mhchem, TeX/LaTeX, Excalidraw, PlantUML, Graphviz/DOT, Vega-Lite, and Markdown footnotes), can display notes in vertical lanes like JIRA, and offers free iCloud sync. Currently in early alpha.

Builders @sliqqq

Productivity

Interactive code explainer

An interactive explainer for code that helps developers rebuild and maintain their working theory of a codebase and its architecture when agents write most of the code, letting them learn the architecture before or while designing the next feature rather than after.

Builders @iamwil

Developer toolsEducation

Korean-based APL/BQN-like language

A programming language in the APL/BQN family that uses Korean to compactly express and compose the meanings of its operations.

Builders @iamwil

Developer tools

Simple Machines Made Complicated

An interactive book in which each page is a working mechanical mechanism, like a book full of fidget toys. A follow-up to the author's earlier book 'Simple Machines Made Simple', it devotes one page to each of the six simple machines and their progressions to complex machines (e.g., wheel to gears), including a planned more complex pulley example that must fit within a 5mm page thickness.

Builders @hacky_engineer

Creative tools & mediaEducation

LemonLink

This tool generates a shareable link for any URL that shows whether the link was opened by a human or by an AI agent, and when it was opened.

Builders @lemonlinks

AI & automationData & analytics