Wesnoth is a great FOSS game
Battle for Wesnoth
The Battle for Wesnoth is an open source, turn-based strategy game with a high fantasy theme. It features both singleplayer and online/hotseat multiplayer combat.
Explore the world of Wesnoth and take part in its many adventures! Embark on a desperate quest to reclaim your rightful throne... Flee the Lich Lords to a new home across the sea... Delve into the darkest depths of the earth to craft a jewel of fire itself... Defend your kingdom against the ravaging hordes of a foul necromancer... Or lead a straggly band of survivors across the blazing sands to confront an unseen evil.
The choice is up to you...
https://www.wesnoth.org/https://store.steampowered.com/app/599390/Battle_for_Wesnoth/http://pcgamingwiki.com/api/appid.php?appid=599390
