What are some alternatives?
When comparing Unvanquished and Punch Club, you can also consider the following products
Quake - Quake is a series of first-person shooter video games released by id Software.
BotBoxer - A first ever robotic punching bag with computer vision
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.
PunchLab - Track the strikes you throw at the punching bag
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
ROBOCRAFT - Robocraft is an Action-Adventure, MMORPG, Vehicular-Combat, Shooter, Sci-Fi, Strategy, and PvP video game developed and published by Freejam.