What are some alternatives?
When comparing Wrack: Exoverse and Freedoom, you can also consider the following products
Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
Zandronum - Leading the way in newschool multiplayer Doom online.
GZDoom - ZDoom is a family of enhanced ports of the Doom engine for running on modern operating systems.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
DotA 2 - Dota 2 is a Free-to-play, Action-Adventure, Multiplayer Online Battle Arena, Single and Multiplayer video game created and published by Valve Corporation.
Quake - Quake is a series of first-person shooter video games released by id Software.