I have added OpenArena to Itch
hereIt is currently unlisted and unsearchable but unless someone spots any bad things then I'll let it go public soon.
While it is possible to download games directly from Itch, the release is primarily meant for the Itch App. Downloading, extracting and fixing permissions are not for everybody. Even I sometimes prefer the convenient way over the right way.
The Itch App supports patching, so I hope to be able to perhaps provide updated binaries more frequently.
The release does also include the community map pack because I want it to require as little effort as possible.
I have even tested this on Mac OS X with the app, just to ensure that it works out of the box and does not require manual permission handling. Only problem is that it still complains that we do not have a 64 bit binary.
Despite some attempts at compiling a new Mac version I have failed. I can compile. I can start it but it crashes when entering a map. The OS X version is split on Itch for my convenience. I can test the other two much faster.