When is Civilization not Civilization? When it’s Unciv, a free to play, open-source reimagining of Sid Meier’s Civilization V that’s being developed by volunteers on GitHub. After nearly three years in development and releases on Android, Linux, and through itch.io, Unciv’s now moving its units onto Steam. You'll be able to play multiplayer Unciv, but that involves using Dropbox for syncing, which isn’t free to use.