I was slightly disappointed at C2 going commercial at first but then I understood it will have faster development, take a look at ZeldaClassic game engine for example, ZC's last version is unstable and latest version has been under construction for I don't know how long and it's not even released yet, SRB2 is pretty much the same, the dev's work on it when they feel like it and they can abandon it at will, not to mention most have a job and a family/life, it took them 11 years for version 2.0.X to come out since version 1.90, hence I understand and support Ashley's decision here, nobody wants a product that keeps getting slown down and having low priorities and possibly forgotten now does anyone? I sure don't.
Anyway few may know about this but I'l post it here.
Retribution engine, it is an easy FPS game creator without any coding knowledge needed, it is also free and you can produce your favorite Quake 2/HL1 styled FPS game for free with it, tough you are not allowed to sell them according to it's license but you can make a full fledged large FPS game with it, it isn't widely known either so there aren't any custom games/maps/whatever made by it around sadly.
Compared to FPS Creator I find Retrib's AI much more fun and harder and it doesn't take ages to load a game and it is somewhat more flexible and easier to use and a much more professional map editor program. (it looks slightly like Valve's hammer editor for HL games)