Open Source arena shooter. Written in C.

Open source arena shooter. Written in C.

Open source arena shooter. Written in C.

NOT OPEN SOURCE. However, you have access to all of its assets, creation tools, and scripts, meaning you can practically make an entirely new game.

NOT OPEN SOURCE. However, you have access to all of its assets, creation tools, and scripts, meaning you can practically make an entirely new game.

NOT OPEN SOURCE. However, you have access to all of its assets, creation tools, and scripts, meaning you can practically make an entirely new game.

Not open source, but the assets and scripts are completely open for high-level modification. You can also run it on OpenMW, a GPL alternative.

Open source DLL's written in C++. Runs on Source Engine. So many great mods have been made with it.