Castlekeep
Castlekeep takes place in the european middle age. It's about creating a colony after your imagination - from a little village to a whole kingdom. You have to organize everything by yourself - construction, economy and defense - just like in real life, in a real community. But of course it's not only about creating a kingdom successfully, you also have to keep an eye on enemies who are in the most cases not that far away from you, waiting for their chance to attack.
Documentation
http://castlekeep.github.io/documentation/
Build instructions
Linux/Unix
Get the source:
git clone git://github.com/castlekeep/castlekeep.git
cd castlekeep
Create a build directory:
mkdir build
cd build
Configure:
cmake ../
Build:
make