Most people, myself included, would recommend ...
- Superior Drummer for obvious reasons. Exceptional sounds, many expansions, mapping abilities, tweaking abilities etc. No introduction necessary. Visit Toontrack.
- Addictive Drums. Same reasons as per above. Notable is however that they take up far less space, which is a compromise, very evident when listening to the somewhat compressed sounds and cymbals with less sustain. Still my number 2.
- Steven Slate Drums. Since incarnation 4 (outside of Kontakt, previously 3.5) it has its own player and mapping abilities with great samples and kit. I have however only experience with the Kontakt version so far.
- BFD is also popular. Never took to it myself since I hated the GUI.
- Abbey Road Drummer/Studio Drummer: A series of libraries for Kontakt. Actually really good, with sound I can't find in Superior Drummer for example. Especially like the 70s kit (both Ludwig and Premier Dry). Mapping abilities also superb.
- Ocean Way Drums: For Kontakt. Haven't been on the map for a long time AFAIK. Was previously top notch, but other libraries surpass them.
- Mixosaurus: Uwe from Germany created this one. Also for Kontakt. ONE kit of 120 GB. Went off the market in 2012 due to unclear reasons and was bought up by someone else. Haven't surfaced since AFAIK(?). But the sounds and realism were incredible. Would truly love to have this one.
I play most of these on my Yamaha DTX900 by the way.