1: Enable OMEMO support https://conversations.im/omemo/ OTR is outdate, many are speaking well of OMEMO.
2: SkypeWeb support, is a plugin that allows you to run skype without having to run the official skype program, this a example: https://github.com/EionRobb/skype4pidgin/tree/master/skypeweb 3: Facebook Chat Support, facebook dropped support to XMPP, but is possible make a plugin with API, see example: https://github.com/dequis/purple-facebook I have not yet seen a list of plugins to be added in kopete as it has in the pidgin page, if it does not already exist, it would be interesting to have it.