Top 253 Show HN Open-Source Projects & Libraries (April 2026)
launchesBrowse newly launched open-source repositories, developer libraries, and community software in April 2026. Use this list to explore open-source tools.
Hacker News Digests — April 19, 2026
https://clawdecode.net— ClawDecode – What we found reading all 512K lines of Claude Code's leaked source
https://cushionmd.com— Obsidian and Cursor had a baby. It's open source
https://pyre-lang.org— Pyre: New JIT Python interpreter written in Rust
https://nohuman.team— NoHumanTeam-one command installer. Team powered by OpenClaw
https://clawlock.io— ClawLock: The Control Plane for OpenClaw
https://sycamore.dev— Sycamore – next gen Rust UI library powered by fine-grained reactivity
https://mediquest-en.vercel.app— MediQuest: Free quiz matching med students to their ideal specialty
https://app.mdalpha.ai— Mad Dog Alpha is now open beta
https://asrank.caida.org— ASRank
https://wasaconf.org— 4D business analysis with parallel AI agents (AofA-inspired)
https://only8.org— Only 8% of Barcelona's 4,589 streets are named after women
https://rslstandard.org— RSL: Simple Licensing
https://repofortify.com— RepoFortify – Production readiness scanner for GitHub repos (free, no signup)
https://midicrossword.org— Midicrossword
https://lemonade-server.ai— Lemonade by AMD: a fast and open source local LLM server using GPU and NPU
https://survey.helloproduct.ai— UX Surveys – Run SUS, UEQ, UMUX-Lite, and NASA-TLX for Free
https://dicebear.com— DiceBear is an avatar library for designers and developers
https://occam.fit— Symbolic regression as an MCP tool (SINDy and PySR, free, no install)
https://reviewskits.com— Reviewskits – Open-source, headless, and self-hostable social proof
https://shiro.apache.org— Apache Shiro – Lightweight framework-agnostic security framework
https://frisky.click— I made an free app that moans when you tap your iPhone, iPad, or Mac
https://codictate.app— I built a free open-source Wispr Flow clone
https://libraryoftime.xyz— Library of Time
https://garryslist.org— Garry's List
https://docs.anarchai.org— Meshllm – Pool compute to run powerful open models
https://localsend.org— LocalSend: Share files locally between devices
https://riskquiz.me— A quiz that scores your job's AI replacement risk (Anthropic/ILO/OECD data)
https://vim-classic.org— Vim Classic
https://republic.civlab.org— Republic – the best way to monitor the situation in SF
https://verdisgov.org— Government of Verdis
https://optiland.org— Design Optics with Python
https://apfel.franzai.com— Apfel – The free AI already on your Mac
https://asm.squr.ai— Free external attack surface scanner – enter a domain, get results in ~60s
https://atgeo.org— ATGeo: Places for AT Protocol
https://clausewize.com— ClauseWize – Upload a contract, get risk score and negotiation language
https://lorespec.org— LoreSpec – Structured knowledge extraction from AI conversations
https://waywardweb.org— The Wayward Webring: a collection of link collections
https://gitmindpro.com— GitMindPro – Scan any GitHub repo for AI-injected security risks
https://inaturalist.org— iNaturalist
https://tinygo.org— Go on Embedded Systems and WebAssembly
+ 213 more verified launches in full dataset...
Key Launch Stats (Show HN Open-Source Repositories — April 2026)
During April 2026, a total of 253 product launches were recorded in this category up to 2026-04-19.
Here is a quick look at launch activity and naming characteristics:
- Total Launches: 253 domains
- Busiest Launch Day: 2026-04-09 (26 launches)
- Average Domain Name Length: 9.5 characters
- Shortest Domain: sr.ht
- Longest Domain: projectivegeometricalgebra.org
- Clean / Single-Word Domains: 91.3%
- Common Name Prefixes: open (14), my (4), the (3), pro (3), get (3)
- Common Keywords: ai (68), ui (27), app (23), dev (20), agent (19)
How to Use This Data
You can use this list of Hacker News and builder releases to find emerging tools, track indie projects, or connect with early-stage builders.
To browse or download the full master dataset of 15,500+ startup launches in CSV and JSON formats, visit the Launches Master Dataset.