Signal FOSS is a fork that takes out the closed source bits. More info here: https://www.twinhelix.com/apps/signal-foss/ It still connects to Signal's centralized server and doesn't provide an option to connect to any other server. And that server requires you provide your phone number, but it's at...

Because Signal is suspiciously toxic and hostile towards any fork. So far Molly managed to stay alive, but I'm sure the Signal company will find a way to kill it the moment it gains traction. Do not trust a network that won't allow third party clients, that won't regularly publish the source code t...