Sorry my suggestion is not abou game engine. But my suggestion is for shifting this forum's engine from featurless UBB to a more advanced and 3DGS comunity suited like Vbulletin etc. It would take hours if i point out problems with this forum and compare it to something like vbulletin.
But these 2 examples are enough.
Showing similar posts to one u r reading.
(And most imortant thing for this comunity). Advanced and more accurate search engine.

Source:
I am a web developer