Best Open Source Conferencing Software 2025

Conferencing Software

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Browse free open source Conferencing software and projects below. Use the toggles on the left to filter open source Conferencing software by OS, license, language, programming language, and project status.

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1

Zulip

Powerful open source team chat application

Zulip is a powerful open source group chat application that combines the immediacy of real-time chat with the productivity benefits of a threaded conversation model. Zulip’s unique threading model allows users to easily catch up on important conversations, helping to save time and increase productivity.

Downloads: 1 This Week

Last Update: 2025-10-24
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2

Draft Notes

Grab screen areas and note it with a mouse, pen & keyboad quickly.

Especially for learners watching some lectures online or using video capturing devices. Grab screen areas with a click (or tap), automatically save it and allows adding notes on it using mouse, pen and keyboard - very quick (and draft). Then it is possible to view grabbed screenshots and annotate it additionally with the same set of tools, easy and convenient. May be help to somebody these sad days.

Downloads: 2 This Week

Last Update: 2023-12-30
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3

Cournal

Cournal is a collaborative note taking and journal application using a

Cournal allows multiple users to annotate PDF files in real-time. The goal of this project is a full featured note taking application (like Xournal or Windows Journal), which allows multiple people to collaborate (like Gobby).

Downloads: 0 This Week

Last Update: 2012-07-30
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4

ONESET

A Web-Application working in conjunction with the obby protocol to view documents written by other people live on a website, integrated with mediawiki and equipped with full LaTex support. It's main purpose is Real-Time Note-Taking at University

Downloads: 0 This Week

Last Update: 2013-04-22
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