I figured I should let everyone know that Quake2World is not dead. In fact, there have been a few flurries of development activity over the summer months which included:
Most recently, the OSX port has received a lot of attention from yours truly. It's now extremely easy to compile and install Quake2World on your Mac, and I encourage you to give it a try.
In the near future, you can expect an update to Jester's already excellent level Gehenna, plus functional enhancements to the graphical menus.