I guess you already know about https://wesnoth.org/ It is probably the most well-known free and open source turn-based game. - Source: Hacker News / over 1 year ago

The Battle for Wesnoth is an underrated tactical game… and it’s free! There are some amazing people that have been working on content for this game for over 15 years. Source: about 2 years ago

The Battle for Wesnoth is completely free and one of the best turn-based tactical games I’ve played. Source: about 2 years ago

Battle for Wesnoth is talked about a lot among open-source gaming fans, but not enough in the community at large. It's a turn based tactical RPG that comes with many scenarios that are full games in themselves. Cross platform, moddable, over 200 different unit types… just an amazing game, all completely free. You can get it on Steam, itch.io, or at https://wesnoth.org and you really, really should. Source: over 2 years ago

Battle for Wesnoth (free at wesnoth.org) Langrisser/Warsong clone game. Source: over 2 years ago

However, we do have pretty good artists, some solid animatics of the bigger RCPs, and some pretty decent codefriends. A small, unique, tractable webgame might help market the community, especially if it's built around a good story. A weird, interesting little game like paperclip maximizer or dark room could perform very well - those always seem to get substantial traction. Likewise, a short visual novel with solid... Source: 12 months ago

Save for the early oughts timeframe and the lack of an explicitly high fantasy setting, A Dark Room (2013), one of the earlier lo-fi idle games, seems to somewhat fit the bill: given the browser-based interface, a mostly gray scale UI, an on-screen world map (available in the later phases of the game), and the lack of leveling in favor of infinite progression. Source: 12 months ago

A Dark Room is one of the first incremental games that came out after Cookie Clicker kicked off the craze, and it's free. Source: 12 months ago

A Dark Room - Free text based browser game where you harvest resources, hunt and explore, and develop a small society. Https://adarkroom.doublespeakgames.com/. Source: about 1 year ago

A Dark Room: Another little game that starts simple, with unfolding mechanics, but which doesn't overstay its welcome. Source: over 1 year ago