Review of Tox powered by the Slant community.
Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Pro Multiple front-ends for multiple platforms available
Pro Privacy focused
Tox uses military grade encryption and works completely peer-to-peer.
Con Early stages of development
Since Tox is relatively new, it has important features missing (like group video) and requires a proper code review before it can be deemed reliable and ready for everyday use.