As you know Clubhouse is very popular right now, but there are some issues such as privacy, server performance, and etc.
Then, 2 open-source software shows up. To use them you don't need to install any application on your smartphone.
Jam
https://www.producthunt.com/posts/jam-an-open-source-clubhouse
[Code]
https://gitlab.com/jam-systems/jam
DogeHouse
The big difference is that DogeHouse has a chat function.
https://www.producthunt.com/posts/dogehouse