Discord is a free voice/chat software. Can be downloaded as an app or used in a browser.
WWII era aircraft: https://discord.gg/yJaP5Wn
Flightgear FDM School: https://discord.gg/Uyrtsar
Operation Red Flag military FG community: https://discord.gg/ptVapkE
Aircraft Mirage 2000: https://discord.gg/xZ3r2KR
Aircraft Saab 37 Viggen: https://discord.gg/RJTwS9a
Aircraft F-16: https://discord.gg/8RcYnjA
Aircraft Panavia Tornado: https://discord.gg/26rvkr2
Aircraft Jaguar: https://discord.gg/G5q5XYN
Aircraft MiG-21bis: https://discord.gg/bs8xyz3
- Furthermore several other Flightgear servers exist, that you may need an personal invite to join.
Its advised that you create a permanent account, instead of creating guest accounts as some people create duplicate accounts which clogs up the member logs and makes it more difficult to @mention people.