Ask Slashdot: FOSS, Multiplatform Skype Replacement for PC-to-PC Video Chat?

obarthelemy writes "Skype having just been borged, now may be a good time to hedge our bets and look for a replacement. I'm *not* looking for something that interfaces with POTS, but just a simple PC-to-PC video chat tool that is very easy to configure and use, reliable, multiplatform (my family has Windows, Linux, MacOS; iOS and Android would be nice extras), and has good video/voice quality. We're almost only skyping with each other. What would you recommend?"