The team behind the Prosody XMPP server has packaged up Prosody, helper programs and, I think, the Conversations Android app:
https://snikket.org/
Introduced in February, but apparently I missed it:
https://blog.prosody.im/introducing-snikket/
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko