I'm fine with competitor/anything links being posted.
Wedge is no longer 'improved' but it's still maintained when a bug is mentioned. Just look at the activity feed at github.com/Wedge/wedge, it's just fine.
I mostly maintain Lestrades.com which is based on Wedge, so whenever I fix a bug in Lestrade's I try to think of backporting it to Wedge. Win-win.
The only 'active' SMF-based forum platform I'm aware of is ElkArte. Plus it's made by cool guys. I prefer Wedge over it, of course, but it's obviously because I built all the features I wanted into it. There are simply no further features I'm interested in, so I'm not implementing anything.
Plus, seriously, I spent 5 years working fulltime on Wedge for no rewards... No one can expect me to keep maintaining it, but I'm still on it from time to time.