The Battle for Wesnoth

Wesnoth is a turn-based strategy game set in a high-fantasy world. You recruit units from several factions, move them across a hex map and fight where terrain, time of day and unit experience all change the odds. Veteran units level up and carry over between scenarios, so campaigns reward keeping your army alive rather than trading units freely.

The game ships with a long list of single-player campaigns, skirmishes against the AI, hotseat play and an official online multiplayer server, plus a map and scenario editor and a large add-on library. On the Mac it is distributed through the Mac App Store, Steam, itch.io and DMG installers hosted on SourceForge. The project keeps a stable 1.18 series alongside a 1.19 development series, so check which one a download belongs to. The code is GPL v2 or later, while game art and music are under either GPL v2+ or CC BY-SA 4.0 depending on when they were contributed.