Public - Group chats.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Chalk - Chalk is a calculator that tries to do right what others do wrong.
Quake - Quake is a series of first-person shooter video games released by id Software.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.