Not to take away from the seriousness of the moment, but I feel compelled to share my feeling shere: My inner teenager was hoping to see TeamSpeak and Ventrilo listed just to honor the good old days. Between 2005-2008 it felt as if Ventrilo had about 90% of the market, with TeamSpeak having the rest. I guess the hopeful message is that nothing lasts forever and alternatives come and go.

Mumble is similarly old (3 or 4 years newer), and free software unlike the other two (the trick to longevity). Still around and updated. I used it just a couple days ago.