Egoboo is a working cool 3D dungeon crawling game in the spirit of NetHack. It supports Windows, Linux and Mac.
Egoboo is made available publicly under the GNU GPLv3 License.
Developers can usually be contacted via GitHub.
Checkout the repository
git clone https://github.com/egoboo/egoboo
into some directory called the source directory.
Change into the source directory and initialize and update the submodules
git submodule update --init --recursive
Next, perform an out of source build by creating a directory called the build directory. The build directory must reside outside of the source directory. Change into the buid directory and enter
cmake <path to source directory>
where <path to source directory> is replaced by the actual path to your source directory.
CMake will generate the environment specific build files (e.g., Visual Studio files, Make files, etc.) in the build directory.