Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
Unity - The multiplatform game creation tools for everyone.
GSC - With GSC, you can pick from any of 14 worldwide datacenters to host your own free voice server.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.