On X-plane.org:

Mr. X posted V2 of KBOS and it's a stunner!
Mr. X posted new version of Mr. X library V2 (needed for V2 of KBOS}
Challenger 600/605 freeware
RV-12 freeware
Really nice scenery of KBGR Bangor ME
Really nice scenery of Sun N' Fun (Lakeland airport)

All are freeware and don't forget to thank the authors.

Bob