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- Scorched 3D is a 3D remake of an artillery game Scorched Earth.
- A Second Face is a sci-fi adventure game.
- Seiklus is an ambient single-player action-adventure game.
- SimSig is a train simulation game based on real UK signalling systems.
- Skifree is a Windows 95 game.
- Soldat is a 2d, fast paced, action multi-player shooting game with many different game modes and weapon choices.
- Space Combat is a 3D space simulator featuring realistic physics.
- Space Tanks is a 2D/3D gravity game featuring realistic physics.
- Spelunky is a platforming game that utilizes roguelike gameplay. (Should be moved to List of open source games).
- Stepmania A rhythm based online capable game.
- SubSpace is a 2D top-down space shooter game with massive multiplayer capabilities.
- Super Cosplay War Ultra is a 2D fighting game featuring cosplayers.
- Synaesthete is a student-created psychedelic rhythm shooter.
- Synth uses procedural generation for the graphics and level design.
- Syobon Action is a Japanese game notorious for its difficulty.
Read more about this topic: List Of Freeware Video Games