Yamaha Vintage Kit:
http://www.hydrogen-music.org/download/drumkits/YamahaVintageKit.zip

EasternHop-1:
http://surfnet.dl.sourceforge.net/sourceforge/hydrogen/EasternHop-1.tar.gz

Roland TR-808:
http://rolandclan.info/media/samples/tr-808/Roland_TR-808.h2drumkit

Sonor Designer Kit:
http://bahamut54321.free.fr/SonorDesignerKit.h2drumkit
http://www.musikhuset.org/~bunnadik/SonorDesignerKit.h2drumkit