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Alternatives to Discord and Twitch
(programming.dev)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
You might want to try a service based on XMPP instead of Matrix due to how Matrix caches all the chats its users are in. If you want to go the XMPP route, Movim is the most similar to Discord.
For streaming, I've heard of Owncast as a FOSS alternative. I don't stream nor do I watch them, so please don't consider this more than pointing out what's available