Unciv
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Oh wow endless Sky looks interesting. I have been trying out Space Station 14 as of late. Quite cool game with a crazy community. I would like to have a German server though.
looks like nobody mentioned Warzone2100 yet. SciFi rts. I don't know how many hours I lost to OpenTTD. Bitburner was FOSS too, I guess. I might check my library later to extend the list...
My personal favourite is Dungeon Crawl Stone Soup, although it's quite tricky to get into and still brutally difficult, even if you are in it.
It's similar in concept to Shattered Pixel Dungeon, which others have mentioned here. Maybe try that one first. 🙃
I like simutrans a lot (maybe the most elaborated TTD-like transport game), and I am trying to learn freeciv, but it is a bit "technical". I also like minetest, I have constructed a lot of big houses, the only FOSS game where you can cook a lot of recipes.
FreeCiv is a bit technical yeah. What I've been trying to master is FreeOrion. It seems really cool but the interface is hard to use.
What is Mine Test like and how does it compare to Minecraft? I've been meaning to try it for myself. :)
I believe minetest is made in Lua, and it does not need restart to apply mods. Minetest is FOSS, does not has all the UI and graphic enhancements of Minecraft, but it runs in very old machines, is lightweight (maybe 100 mb or less), it has a lot of people playing everyday (more than 200, big servers usually receive less than 64 players), has a lot of modding community...
Minetest is mostly implemented in C++, but its mods and game content (which are also just mods) are implemented in Lua.
My personal favorite advantage of Minetest over Minecraft is the larger world height. Minetest's worlds are 62000 blocks high, compared to Minecraft's 384 blocks.
You certainly don't need most of those 62000 blocks, but 384 is quite limited, especially with only 128 underground. It means that Minecraft's caves are all rather flat and there's practically no challenge in getting to the rarest minerals.
With Minetest, it's actually worth going down the more vertical caves rather than just digging, and it's worth building intermediary bases. Minetest was the first time I felt minecarts and ladders were useful while mining.
It makes mining challenging and fun, even without mobs.
I used to play hours on OpenTTD, but I don't really play anything currently
Shattered Pixel Dungeon is currently the one that has me gripped most.
Apart from that it's probably those derived from id engines. Last one I played was Jedi Outcast.
Shattered Pixel Dungeon the most active fork of pixel dungeon, a rogue like dungeon crawler:
Pros: Simply fun
Polished AF
Has a lot of well balanced items, enemies and unique classes/sub-classes (giving it infinite replayability) actively updated
Also has a lot of great and unique forks (commonly called "Mods" by the community) such as Rat King Adventure
Has good support for both PC and phones (I also think it works well with controllers)
Cons:
You will die
You will die a lot (don't worry, it's worth the pain)