It seems like an awesome project that fulfills a lot of the requirements for bridging many popular messaging platforms (like FB messenger, WhatsApp, discord, signal, and more). I wanted to share because I know a lot of us have friends and family who still use antiquated/proprietary communication platforms. Fair warning, I have not tried self hosting it myself yet since my server is kinda of a mess right now. Lmk what y'all think.
Slidge gateways are puppeteering, meaning you need an account to remote control on the external legacy network, but other than that it usually works quite well for a young project like it is.
It does support a crazy amount of networks (it uses libpurple which is the lib of pidgin), unfortunately it lacks modern features and even groups don't work that well. I actually started to work on slidge because I was fed up with spectrum2's limitations and realised that spectrum2's maintainer think, like many others, that XMPP is dead...