Sid Meier's Civilization® IV
Steam: $19.99GOG: $5.99
Sid Meier's Railroads!
Steam: $9.99GOG: $2.49
Siege Survival: Gloria Victis
Steam: $24.99GOG: $2.49
Siege Survival: Gloria Victis Prologue
Steam: FreeGOG: Free
Sigma Theory: Global Cold War
Steam: $17.99GOG: $5.45
Signal Ops
Steam: $9.99GOG: $0.99
SimCity™ 3000 Unlimited
Steam: $4.99GOG: $4.99
SimCity™ 4 Deluxe Edition
Steam: $19.99GOG: $4.99
Sin Slayers: Reign of The 8th
Steam: $19.99GOG: $4.99
Sins of a Solar Empire II
Steam: $49.99GOG: $49.99
Sins of a Solar Empire: Trinity®
Steam: $9.99GOG: $9.99
Sins of a Solar Empire®: Rebellion
Steam: $19.99GOG: Free
Six Ages 2: Lights Going Out
Steam: $24.99GOG: $16.25
Six Ages: Ride Like the Wind
Steam: $19.99GOG: $8.99
Sky Cannoneer
Steam: $14.99GOG: $1.49
Sky Haven Tycoon - Airport Simulator
Steam: $19.49GOG: $2.89
Sky Knights
Steam: $9.99GOG: $0.89
Skyshine's BEDLAM
Steam: FreeGOG: Free
Slay the Spire
Steam: $24.99GOG: $24.99
Slipways
Steam: $16.99GOG: $6.79
Smart City Plan
Steam: $15.99GOG: $7.49
Smelter
Steam: $19.99GOG: $5.99
Smugglers 5
Steam: FreeGOG: Free
Smugglers 5: Invasion
Steam: FreeGOG: Free