Unity - The multiplatform game creation tools for everyone.
Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
GSC - With GSC, you can pick from any of 14 worldwide datacenters to host your own free voice server.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.