I love Jitsi. Since the latest version even the remote desktop sharing on my ubuntu systems is working.
Small tip: Use IPv6. If either party can not get a native connection google for a free tunnel provider. Start jitsi with -6 as parameter and it will prioritise v6 connections. This fixed all kinds of 'nat-nat-nat' setups that some friends are forced into. (Make sure the implications of having a public address are understood.)
Another wonderful thing about jitsi is the availability for multiple platforms and crypto support for otr or zrtp.
Small tip: Use IPv6. If either party can not get a native connection google for a free tunnel provider. Start jitsi with -6 as parameter and it will prioritise v6 connections. This fixed all kinds of 'nat-nat-nat' setups that some friends are forced into. (Make sure the implications of having a public address are understood.)
Another wonderful thing about jitsi is the availability for multiple platforms and crypto support for otr or zrtp.