I'm using current ejabberd which is very, very stable and feature rich. As to clients I've http://www.psi-plus.com/ http://www.psi-plus.com/ on Ubuntu and https

I'm using current ejabberd which is very, very stable and feature rich. As to clients I've http://www.psi-plus.com/ http://www.psi-plus.com/ on Ubuntu and https://github.com/siacs/Conversations https://github.com/siacs/Conversations on Android (which can be compiled from source if e.g. you don't have Google Play).