There are 1 open-source alternatives to zulip in this directory. The most popular is Signal-Server with 10.2k GitHub stars. All are open source, free to use, and many can be self-hosted.
The top three are Signal-Server(10.2k stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
Get notified about new tools and updates to existing ones.