T-racks is cool for mastering, been a looong long time since I’ve used it though! Need to get the slate plug-ins at some point as well, they use them at the studio I used to work at for a bit of post processing and they’re awesome!
Agree with @Grivanov Omnisphere and Trillian is a best virtual instruments for me too!!
Also:
NI Guitar Rig 5
BFD drums
Kontakt !!
Serum
Grand (for Kontakt)
e.t.c.
The Reason Shop opened a while ago . Reason Extensions are the plugins of Reason , and for a while everybody can make and sell Reason Extensions . SO yes , 3rd party is available . . They already made some famous VST’s into plugins . The Reason Shop is like a RE mega-mall now , impossible not to find what you need/like .
yeah I stopped using Reason 5 a while ago and moved onto Cubase, now using logic and protools. Since then Reason has improved a lot , notably the ablility to drop audio files into the sequencer now, which was why i left Reason 5 in the first place. A friend showed me a few cool rack extensions but i’m still inclined to using Logic, and you can’t beat Protools for tracking! Doesn’t mean they’re any better than Reason though it’s just a personal preference for me now!