Top 23 Custom Open-Source Projects

  • Rocket.Chat

    The communications platform that puts data protection first.

    Project mention: ⟳ 4 apps added, 121 updated at | /r/FDroidUpdates | 2023-09-15

    Rocket.Chat (version 4.40.0): Team Communication Tool

  • Mattermost

    Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

    Project mention: IT Pro Tuesday #259 - Collaboration Platform, Cisco Training, SyncML Tracing & More | /r/ITProTuesday | 2023-07-11

    Mattermost offers a secure, open-source solution for seamless collaboration throughout the software development lifecycle. Tailored to cater to technical and operational needs, it easily integrates with a wide range of third-party developer tools—to streamline development and engineering workflows. With self-hosted and private cloud deployment options, coupled with access to the source code, you have complete control over the data via a shared, adaptable, and extensible platform designed specifically for your team. Kindly suggested by Molasses_Major.

  • Appwrite

    Appwrite - The open-source backend cloud platform. Add Auth, Databases, Functions, and Storage to your product and build any application at any scale while using your preferred coding languages and tools.

  • Jitsi Meet

    Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.

  • Zulip

    Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

    Project mention: Ask HN: What are some unpopular technologies you wish people knew more about? | | 2023-12-02

    (1) Zulip Chat - - seems to be reasonably popular, but more people should know about it

    I’ve been using it for over 5 years now [1], and it’s as good as ever. It’s way faster than any other chat app I’ve used. It has a good UI and conversation model. It has a simple and functional API that lets me curl threads and write blog posts based on them.

    (only problem is that I Ctrl-+ in my browser to make the font bigger – I think it’s too dense for most people)

    (2) re2c regex to state machine compiler -

    A gem from the 90’s, which people have done a great job maintaining and improving (getting Go and Rust target support in the last few years). I started using it in 2016, and used for a new program a few months ago. I came to the conclusion that it should have been built into C, because C has shitty string processing – and Ken Thompson both invented C AND brought regular languages to computing !!

    In comparison, treesitter lexers are very low level, fiddly, and error prone. I recently saw dozens of ad hoc fixes to the tree-sitter-bash lexer, which is unsurprising if you look at the structure of the code (manually crawling through backslashes and braces in C).

    These fixes are definitely appreciated, but I think it indicates a problem with the model itself.

    (based on


  • ZeroNet

    ZeroNet - Decentralized websites using Bitcoin crypto and BitTorrent network

    Project mention: Its Time to make ZeroNet great again! | /r/Satoshispl | 2023-11-09

    ZernoNet project: GitHub - HelloZeroNet/ZeroNet: ZeroNet - Decentralized websites using Bitcoin crypto and BitTorrent network

  • Synapse

    Synapse: Matrix homeserver written in Python/Twisted.

    Project mention: GrapheneOS is moving off Matrix | | 2023-11-21

    some context re the Matrix isses, long history apparently:

  • Element

    A glossy Matrix collaboration client for the web.

    Project mention: O Fazueli está destruindo o Sul do Brasil | /r/brasilivre | 2023-11-19
  • Onboard AI

    Learn any GitHub repo in 59 seconds. Onboard AI learns any GitHub repo in minutes and lets you chat with it to locate functionality, understand different parts, and generate new code. Use it for free at

  • Lets-Chat

    Self-hosted chat app for small teams

    Project mention: Group chat that doesn't allow DMs? | /r/sysadmin | 2023-06-20

    There are a few open source locally hosted chat services out there. "let's chat" is one I just came across with a quick search, running on a node.js + mongodb backend.

  • CustomTkinter

    A modern and customizable python UI-library based on Tkinter

    Project mention: Can I run a python file, located in someone else's repository, through cmd? | /r/github | 2023-08-09
  • Tox

    The future of online communications.

    Project mention: Open source P2P alternative to Slack and Discord built on Tor and IPFS | | 2023-09-11

    How does it compare to the more mature Tox[0]?


  • berty

    Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network

    Project mention: How to explore writing an app for ipfs with rust? | /r/ipfs | 2023-03-05

    Not written in Rust, but may be Berty can give you some ideas?

  • ZFPlayer

    Support customization of any player SDK and control layer(支持定制任何播放器SDK和控制层)

  • Mumble

    Mumble is an open-source, low-latency, high quality voice chat software.

    Project mention: Welcome to mwmbl, the free, open-source and non-profit search engine | | 2023-09-18
  • email-templates

    Create, preview (browser/iOS Simulator), and send custom email templates for Node.js. Made for @forwardemail, @ladjs, @cabinjs, @spamscanner, and @breejs.

  • Persei

    Animated top menu for UITableView / UICollectionView / UIScrollView written in Swift

  • PyQt-Fluent-Widgets

    A fluent design widgets library based on C++ Qt/PyQt/PySide. Make Qt Great Again.

    Project mention: Make Qt Great Again. PFW: A fluent design widgets library based on PyQt/PySide | | 2023-06-24
  • OverlayScrollbars

    A javascript scrollbar plugin that hides native scrollbars, provides custom styleable overlay scrollbars and keeps the native functionality and feeling.

  • ShapeOfView

    Give a custom shape to any android view, Material Design 2 ready

  • 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).

    Project mention: Is async runtime (Tokio) overhead significant for a "real-time" video stream server? | /r/rust | 2023-03-08

    I've been looking at open source video conferencing software options, specifically Jitsi. When reading their deployment docs the phrase "real time" comes up occasionally, for example:

  • TextBelt

    Free API for outgoing SMS

    Project mention: Send and receive SMS with a clean, simple API | | 2023-09-29
  • Kandan

    Kandan is an Open Source Alternative to HipChat

  • Rallly

    Rallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.

    Project mention: Rallly 3.0 is now available for self-hosting | /r/selfhosted | 2023-09-15

    Hi everyone. Just wanted to share an update from my original post a while back about my self-hostable Doodle alternative called Rallly. I released a new version with an updated UI and a lot of highly requested features. For a while this version was only available for users of the managed service ( but I recently just released a new version for self-hosting that brings it up to speed.

  • Transition

    Easy interactive interruptible custom ViewController transitions

  • InfluxDB

    Collect and Analyze Billions of Data Points in Real Time. Manage all types of time series data in a single, purpose-built database. Run at any scale in any environment in the cloud, on-premises, or at the edge.

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). The latest post mention was on 2023-12-02.

Custom related posts


What are some of the best open-source Custom projects? This list will help you:

Project Stars
1 Rocket.Chat 37,612
2 Mattermost 26,918
3 Jitsi Meet 20,692
4 Zulip 18,790
5 ZeroNet 18,072
6 Synapse 11,663
7 Element 10,260
8 Lets-Chat 9,716
9 CustomTkinter 8,990
10 Tox 8,720
11 berty 7,060
12 ZFPlayer 6,995
13 Mumble 5,709
14 email-templates 3,591
15 Persei 3,453
16 PyQt-Fluent-Widgets 3,447
17 OverlayScrollbars 3,177
18 ShapeOfView 3,082
19 Jitsi Video Bridge 2,792
20 TextBelt 2,772
21 Kandan 2,728
22 Rallly 2,671
23 Transition 2,623
Collect and Analyze Billions of Data Points in Real Time
Manage all types of time series data in a single, purpose-built database. Run at any scale in any environment in the cloud, on-premises, or at the edge.