Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
Vivox - Vivox is called to be one of the leading chatting platforms for online gamers.
Clever - syncing between education applications for K-12 schools
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Claroline - Claroline is a collaborative eLearning and eWorking platform.