I've released the July emitter libraries for 3.0 and SE.
In searching for a specific emitter to improve (lightning strike trail) I realized that the older "user" and "contest" emitter libraries that are available for SE were never converted to 3.0 format. I went through those libraries and selected what I consider to be the "best" emitters from those and put them together in an "old_user_best" library for pI3.
So if you do an AutoUpdate on pI3 you should see 2 new libraries available.
I've been trying to get some good "wispy" smoke emitters, something similar to cigarette smoke. It's very difficult, but I think I'm getting some pretty decent results with some of these.