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Top 23 Free Open-Source Projects
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Project mention: What Building Redis, Git and an LLM From Scratch Taught Us About Using Them | dev.to | 2026-10-05
There is a GitHub repository with about 550,000 stars called build-your-own-x. It is not a library. It is a curated catalog of step-by-step tutorials where people rebuild the technologies we all use daily: a SQLite clone in C, Redis in C++ or Python, a container in a hundred lines of Go, git from the inside, a vector search engine, even a small GPT. CC0 licensed, started by Daniel Stefanovic, maintained by CodeCrafters. The epigraph is Feynman: "What I cannot create, I do not understand." This post is about what happens to a team that takes that seriously.
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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Project mention: A Survey of Public APIs for Building a Football Live Score Site in 2026 — Part 1: News API Review | dev.to | 2026-09-05
Candidate source: Every API considered comes from the public-apis repository on GitHub. I chose it because it has more than 400,000 GitHub stars and offers a broad, well-organized set of categories and API options.
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If you’re interested in how it works, the project is open on GitHub.
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Project mention: The Code I Shared: Reflections on 359+ Merged Pull Requests in Open Source | dev.to | 2026-06-21
RocketChat/Rocket.Chat
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data-engineering-zoomcamp
Data Engineering Zoomcamp is a free 9-week course on building production-ready data pipelines. Join the course here 👇🏼
You can sign up here: https://github.com/DataTalksClub/data-engineering-zoomcamp/
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Project mention: Recordly: A cross-platform OSS alternative to Screen Studio | news.ycombinator.com | 2026-07-03
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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Project mention: Armada: Encrypted, Open-Source, Discord Alternative (Built on Nostr) | news.ycombinator.com | 2026-09-28avoid Zulip for a properly secure Discord replacement, givin its lack of (and roadmap refusal for) e2e; https://github.com/zulip/zulip/issues/6096
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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typescript-book
:books: The definitive guide to TypeScript and possibly the best TypeScript book :book:. Free and Open Source 🌹
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stack-on-a-budget
A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com
Project mention: Stack on a Budget (Free Tier Driven Development FTDD) | news.ycombinator.com | 2026-06-14 -
Kavita
Kavita is a fast, feature rich, cross platform reading server. Built with the goal of being a full solution for all your reading needs. Setup your own server and share your reading collection with your friends and family.
Supports: EPUB, PDF, CBZ, CBR, CB7, image folders Deploy: Docker · kavitareader.com · 10.1k stars
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I'll recommend dnscontrol as well, although the post is an unseasonal April fools joke, so helpful suggestions may be out of place.
The is-a.dev project uses dnscontrol to manage a subdomain registration service in GitHub, which is really clever. See https://github.com/is-a-dev/register
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awesome-zhuiju-free
免费无广告的追剧资源指南，人工精选资源、每天检测资源有效性。收录在线影视、影视APP、网盘搜索、磁力BT、字幕、TVBox / 影视仓空壳软件/配置地址、IPTV直播源、会员拼团、影视相关开源项目。开源，社区共同维护。
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typescript-book
The Concise TypeScript Book: A Concise Guide to Effective Development in TypeScript. Free and Open Source. (by gibbok)
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panel
Pterodactyl® is a free, open-source game server management panel built with PHP, React, and Go. Designed with security in mind, Pterodactyl runs all game servers in isolated Docker containers while exposing a beautiful and intuitive UI to end users.
Project mention: Pelican Panel VS panel - a user suggested alternative | libhunt.com/r/pelican/panel | 2026-09-07 -
LibreHardwareMonitor
Libre Hardware Monitor is free software that can monitor the temperature sensors, fan speeds, voltages, load and clock speeds of your computer.
Project mention: LibreHardwareMonitor: FOSS monitor of temps, fan speeds, voltages, clocks | news.ycombinator.com | 2026-07-06 -
webstudio
Open source website builder and Webflow alternative. Webstudio is an advanced visual builder that connects to any headless CMS, supports all CSS properties, and can be hosted anywhere, including with us.
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AIClient2API
Self-hosted multi-protocol AI API proxy for Antigravity, Codex, Grok, Kiro, OpenAI, Claude, and custom providers. Supports OpenAI-compatible API, Claude API, Gemini protocol conversion, GPT, Grok Build, Claude Opus, Gemini Pro, Kimi, MiniMax, provider pools, smart routing, and automatic failover.
Project mention: Igniting the Developer Community: How One Project Earned 1.4k+ Stars in Months | news.ycombinator.com | 2025-11-16 -
VvvebJs
Drag and drop page builder library written in vanilla javascript without dependencies or build tools.
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munder-difflin
an open-source alternative to the dots, bots and muses of the world, run an office of claude code/codex like agents on your laptop, sandboxes or anywhere, uses your existing subscriptions
Crewlo is an independently maintained fork of Munder Difflin, by Chaitanya Giri and contributors. It retains the upstream agent-engine foundation. My work focuses on the procedural voxel studio, the mission interface, activity labels and Telegram/WhatsApp transports.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Free discussion
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Oct 2026
Index
What are some of the best open-source Free projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | build-your-own-x | 550,857 |
| 2 | public-apis | 485,863 |
| 3 | FreeDomain | 202,378 |
| 4 | Rocket.Chat | 46,201 |
| 5 | data-engineering-zoomcamp | 45,974 |
| 6 | Recordly | 32,220 |
| 7 | Zulip | 25,994 |
| 8 | typescript-book | 21,557 |
| 9 | stack-on-a-budget | 12,453 |
| 10 | Kavita | 11,802 |
| 11 | register | 11,464 |
| 12 | awesome-zhuiju-free | 10,835 |
| 13 | typescript-book | 10,358 |
| 14 | startbootstrap-sb-admin-2 | 9,865 |
| 15 | panel | 9,281 |
| 16 | LibreHardwareMonitor | 9,145 |
| 17 | webstudio | 9,014 |
| 18 | AIClient2API | 8,838 |
| 19 | VvvebJs | 8,690 |
| 20 | munder-difflin | 8,452 |
| 21 | BetterChatGPT | 8,391 |
| 22 | thejsway | 7,886 |
| 23 | books | 7,681 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com