Singularity
Steam: FreeGOG: $29.99
Sins of a Solar Empire II
Steam: $49.99GOG: $49.99
Sins of a Solar Empire®: Rebellion
Steam: $19.99GOG: Free
Six Ages 2: Lights Going Out
Steam: $24.99GOG: $24.99
Six Ages: Ride Like the Wind
Steam: $19.99GOG: $19.99
Sky Haven Tycoon - Airport Simulator
Steam: $19.49GOG: $2.95
SKYHILL
Steam: $9.99GOG: $1.49
Slay the Princess — The Pristine Cut
Steam: $17.99GOG: $17.99
Smelter
Steam: $19.99GOG: $5.99
Smugglers 5
Steam: FreeGOG: Free
Smugglers 5: Invasion
Steam: FreeGOG: Free
Snow Plowing Simulator
Steam: $15.99GOG: $15.99
Solo Flight
Steam: $6.99GOG: $6.99
Song of Farca: Prologue
Steam: FreeGOG: Free
Songs of Silence
Steam: $29.99GOG: $29.99
Songs of Syx
Steam: $24.99GOG: $19.99
SPACE ACCIDENT
Steam: $16.99GOG: $14.99
Space Crew: Legendary Edition
Steam: $15.99GOG: $24.99
Space Haven
Steam: $24.99GOG: $24.99
Space Pirates And Zombies 2
Steam: $19.99GOG: $4.99
Space Rangers HD: A War Apart
Steam: $14.99GOG: $14.99
Spacebase Startopia
Steam: $39.99GOG: $9.99
SpaceBourne
Steam: $14.99GOG: $19.99
SpaceBourne 2
Steam: $19.99GOG: $19.99