I remember making maps with the amazing map editor when I was 13. I was hit by an avalanche of memories and feelings seeing this. I am very happy that the project is going on and I will download to play it soon.
I remember tweaking the Cube source to compile with MinGW, to allow for community mods on Windows (even the most basic version of VC++ cost a lot of money back then!). And then the CubeCTF mod that I made with that, back in 2003. It wasn't just the editor that was fun to poke around; the source code was also very educational.