The UZDoom (forked from GZDoom, now the successor to it) team is looking to improve UNIX support for UZDoom, but they don't have any maintainers for the BSDs. I don't have enough experience with the way UZDoom works internally (kind of a messy project as it was forked from a complete mess) and I am way too busy, scatterbrained, and generally incompetent at everything I do to maintain a port and keep it up to date. They said they are open for a port, if they can find a maintainer. GZDoom is basically dead, as the entire development team left, and all features that were planned for the next few versions of GZDoom have now moved over to UZDoom.