X-Plane Freeware Project have some amazing aircraft for X-Plane, the two good ones are the 757 and MD
-80 which are still in beta, so you have to be a beta-tester, which anyone can be! The 757 hI would say is closer to being done than the MD
-80. The 757 is great, and soon will have a new sound-set and Virtual Cabin. It has spinning fan blades and the wings are fantastic. The MD
-80 has opening doors and such, but still has some flaws.
They also have a great Airbus series too which are older but are still good. You have to become a member, but it's free. http://www.xplanefreeware.net/forums/index.php
I don't know too much on the Tupolev, but X-plane.org has an okay ERJ-145 model that someone uploaded. I hope this helps, as there really isn't much choice for x-plane add-on aircraft.