You need to download the client from Github afaik. Tribyu has no connection to Minecraft anymore.

Luanti is like FOSS Minecraft but it's completely separated from Minecraft.

Wumbo

You can play on Mac or Linux! While our client is currently optimized for Windows, the open source game engine we use supports Mac/Linux/Android. FOSS for the win!

https://github.com/luanti-org/luanti/releases/tag/5.9.0

gaming

Satlantis is now Tribyu

You can play on Mac or Linux! While our client is currently optimized for Windows, the open source game engine we use supports Mac/Linux/Android. FOSS for the win!

You can download those clients at https://github.com/luanti-org/luanti/releases/tag/5.9.0

And join the game with:
Server IP: play.tribyu.com
Port: 40000


See you in-game!