Ask HN: Alternatives to Skype/Lync
Since a recent upgrade to office 2013 (we're cutting edge like that) skype has gone from buggy to unusable much of the time. From various comments I've seen online we aren't alone in this, so are they any good alternatives?
Our requirements would be:
* Internally Hosted (but working in our offices world wide)
* one-one and many-many text messaging, permanent chat rooms would be nice
* voice chat
* desktop screen sharing
* Ideally capable of presentations (would love to get rid of webex as well)
* AD integration
* Preferably open source
* Preferably cross platform