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Top 23 Custom Open-Source Projects
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Communication tools such as Mattermost and Rocket.Chat support team collaboration.
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Civic Auth
Auth in Less Than 5 Minutes. Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
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Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Golang would have encouraged a lot more contributions, e.g. https://github.com/mattermost/mattermost (I am not affiliated with them).
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Jitsi Meet
Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.
Project mention: The 50 best open-source alternatives to popular SaaS software | dev.to | 2024-07-10GitHub: Jitsi GitHub Repository
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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Project mention: Discord client that works on Win95*, Win98 and above | news.ycombinator.com | 2025-02-03> Because there isn't a good replacement in open source software
https://github.com/zulip/zulip/blob/9.4/LICENSE (Apache 2) and if you mean "good [hosted] replacement" https://zulip.com/for/open-source/
It, of course, does not speak to your decentralized wishlist but I'm sure they'd welcome an issue describing your goals
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Project mention: Unleashed Firmware for Flipper Zero: Unlock Hidden Features and Capabilities | news.ycombinator.com | 2024-08-14
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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With your instance running, you can now use Matrix clients [that support registration tokens] like Element or Nheko to register your user, login and have fun!
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Project mention: Discord has been using ML to determine the gender and age of some of its users | news.ycombinator.com | 2024-05-13
I'm a big fan of Matrix, and run a small homeserver for my family in friends. But if you really want to explore the frontiers peer to peer seems really intriguing because you don't need any server. https://tox.chat/ just to name one.
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berty
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
Depending upon which OS are on. If Android - Briar is the most famous and obvious choice. On iOS? There are not any options really but wasn't any usable one around a year back the last I had checked.
On iOS there are not many options for P2P w/o Internet (I assume that is what you meant - otherwise if you want P2P over Internet then there are some options although not really "truly" P2P of course - and of course if Internet is shut down or overwhelmed then it will be down). There's https://github.com/berty/berty (the last time I tried it was crashing incessantly but it might have improved). I do not know of anything else really (there might be few but I am not sure).
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Project mention: Mumble: An AI app with hands-free journaling and mood detection | news.ycombinator.com | 2024-10-30
Kind of a bad name given the existence of https://www.mumble.info/
Which is a large OSS voice server
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PyQt-Fluent-Widgets
A fluent design widgets library based on C++ Qt/PyQt/PySide. Make Qt Great Again.
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Rallly
Rallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.
Project mention: Rallly: Open-source (AGPL) scheduling tool for organizing events and meetings | news.ycombinator.com | 2025-04-16 -
OverlayScrollbars
A javascript scrollbar plugin that hides the native scrollbars, provides custom styleable overlay scrollbars, and preserves the native functionality and feel.
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email-templates
Create, preview (browser/iOS Simulator), and send custom email templates for Node.js. Made for @forwardemail, @ladjs, @cabinjs, @spamscanner, and @breejs.
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Project mention: Show HN: I built a tool that texts you if your server goes down | news.ycombinator.com | 2025-04-20
> I find these kinds notifications to provide more false positives than correctly detecting downtime
There are services like Textbelt that leave the trigger mechanisms all up to you and your local tools:
https://textbelt.com/
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Jitsi Video Bridge
Jitsi Videobridge is a WebRTC compatible video router or SFU that lets build highly scalable video conferencing infrastructure (i.e., up to hundreds of conferences per server).
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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).
Custom discussion
Custom related posts
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Show HN: I built a tool that texts you if your server goes down
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Rallly: Open-source (AGPL) scheduling tool for organizing events and meetings
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Discord client that works on Win95*, Win98 and above
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The Protesters' Guide to Smartphone Security
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Reviving An Outdated Project
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Campsite/Campsite: The Campsite Monorepo
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It Matters Who Owns Your Copylefted Copyrights
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A note from our sponsor - InfluxDB
influxdata.com | 21 Apr 2025
Index
What are some of the best open-source Custom projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Rocket.Chat | 42,498 |
| 2 | Mattermost | 32,326 |
| 3 | Jitsi Meet | 25,254 |
| 4 | Zulip | 22,655 |
| 5 | unleashed-firmware | 19,067 |
| 6 | ZeroNet | 18,446 |
| 7 | CustomTkinter | 12,245 |
| 8 | Element | 11,662 |
| 9 | Lets-Chat | 9,802 |
| 10 | Tox | 8,750 |
| 11 | berty | 7,826 |
| 12 | ZFPlayer | 7,105 |
| 13 | Mumble | 6,797 |
| 14 | PyQt-Fluent-Widgets | 6,487 |
| 15 | Rallly | 4,191 |
| 16 | OverlayScrollbars | 4,070 |
| 17 | email-templates | 3,694 |
| 18 | Persei | 3,456 |
| 19 | mini-graph-card | 3,362 |
| 20 | ShapeOfView | 3,175 |
| 21 | TextBelt | 3,137 |
| 22 | Jitsi Video Bridge | 2,965 |
| 23 | Kandan | 2,703 |
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Auth in Less Than 5 Minutes
Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
www.civic.com