Freeware Gaming
M.a.r.s. a Ridiculous Shooter is a single and multiplayer shmup with plenty of particles and weapons. Windows and 'nix versions available as well as source code. Invaders: Corruption looks like your typical arena twinstick shooter, but it's much more. Your ship type is generated by a keyword of your choice and all enemies are procedurally generated for some interesting gameplay. I was a Vegas Showgirl is a short, 3D adventure game with some interesting puzzles and characters.