RBYPlus is a Gen 1 mod made by the folks at rby2k10. ( http://www.rby2k10.proboards.com/index.cgi?board=rbyp&action=display&thread=1208 ) It is a very creative idea and I personally believe that it has potential to become even a perfect metagame. However we have been having issues, recently we lost support from the channel that has been hosting RBYPlus and now there is no way to play the mod or explore the metagame. So I ask any and all who are willing to take up this mod their own channel and help this mod and this community grow.
I'm late here but... yeah, I have played it in the past and it is actually a pretty enjoyable metagame. It is the BW-like RBY metagame in the sense that there are lots of usable Pokemon and many strong moves. I think some people may like RBYPlus. At the very least it would be played by some RBY2K10 players I guess.