Engines

• Southpaw engine
• Soviet Strike
• SpeedTree
• Spring Engine
• Stencyl
• StepMania
• Storm3D
• Storm Engine
• Stratagus
• Stride
• Strike Fighters: Project 1
• Stronghold 2
• Super Bomberman
• Super Smash Bros. Brawl
• Super Star Wars
• Swarm Engine
• SWLPC
• Syphon Filter: Logan's Shadow
• TADS
• Telltale Tool
• Terminal Reality
• Tetris
• Tetris: The Grand Master
• The Bard's Tale
• TheEngine
• The Godfather: The Game
• The Quill
• TinyMUCK
• TinyMUD
• TinyMUSE