Three that come to mid immediately (reasonably priced, but not free) are:
-Twiddly Bits (also guitar riffs and more) from www.keyfax.com
-Drumtrax library - www.drumtrax.com
-Wide range of styles from www.groovemonkee.com (They also have lots of free downloads)
These are all unquantised and have great natural feel.
If anyone knows a source of traditional ethnic midi grooves, I would be interested to hear. Some of the above vendors have world categories, but they are more contemporary oriented world or latin-style.