Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
OpenTok - Build a custom video experience using our robust APIs, or add plug-and-play video to your website in minutes using Video Chat Embeds. Start Building for FreeTalk to SalesTalk to Sales .
Vivox - Vivox is called to be one of the leading chatting platforms for online gamers.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
QuickBlox - Cloud communication and data backend.