Mega Man Revolution - A fan-made 8-bit-style Megaman side scrolling shooter game.

Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.

Megaman Origins - Between MM3 and MM4 there was a MM adventure, never told, until now:

Quake - Quake is a series of first-person shooter video games released by id Software.

Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes

Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.