Imperium Galactica
Steam: $4.99GOG: $4.99
Imperium Romanum Gold Edition
Steam: $9.99GOG: $4.99
Independence War™ Deluxe Edition
Steam: $5.99GOG: $5.99
Indoorlands
Steam: $18.99GOG: $18.99
Industry Giant
Steam: $9.99GOG: $1.49
Industry Giant 2
Steam: $9.99GOG: $1.49
Industry Giant 4.0
Steam: $24.99GOG: $1.49
Infectonator 3: Apocalypse
Steam: $12.99GOG: $12.99
InfraSpace
Steam: $24.99GOG: $7.99
Inkulinati
Steam: $24.99GOG: $24.99
Inscryption
Steam: $19.99GOG: $7.99
Instruments of Destruction
Steam: $19.99GOG: Free
Insurmountable
Steam: $24.99GOG: $24.99
Interstellar Space: Genesis
Steam: $29.99GOG: $9.89
Interstellaria
Steam: $9.99GOG: $9.99
Into the Emberlands
Steam: $6.59GOG: $6.59
Into the Stars
Steam: $19.99GOG: $3.59
Invictus: In the Shadow of Olympus
Steam: $9.99GOG: $9.99
Invisible, Inc.
Steam: $19.99GOG: $19.99
Iratus: Lord of the Dead
Steam: $29.99GOG: $2.99
Iron Danger
Steam: $19.99GOG: $1.99
Iron Marines
Steam: $14.99GOG: $14.99
Ironclad Tactics
Steam: $14.99GOG: $14.99
Jagged Alliance 2 - Wildfire
Steam: $8.99GOG: $3.59