Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
Zoho Meeting - Free video conferencing, online meeting, desktop sharing solution from Zoho.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Airtime - Hang out with group video, share music & videos
RaidCall - Free & Light. Setting up is fast and easy; with no need to rent or set up servers. Low CPU usage and minimum memory footprint allows for smooth, uninterrupted communication. im. Group Communication.
Voxox CloudPhone - Get a local or toll-free business number that automatically answers, routes and transfers calls, plus other professional business phone services.