Mistworld is an intriguing setting concept based on RQ/BRP, and it dates back to the mid-eigthies: it's a sort of Magic World companion. There is more related stuff, and other interesting goodness, to be found on Steve's website:
Ere Anon - Stories
I came across this file on the Dragonsfoot forums, where author Steve Marsh was asking for feedback - unfortunately he didn't get much. However, he did give me permission to upload it to BRP Central, so here it is - let's not disappoint him!