Univers Zero is an instrumental prog band. I only own one album, ceux du dehors, but I can testify that it rocks.
Also, Tako's self titled is a quaint little album, very fun but not a masterpiece by any means.
Krautrock is technically a subgenre of prog rock, even though they aren't like other prog genres. It is called prog sice it has the same adventurous spirit in the same time period and was a major influence on english prog. I would reccomend phaedra by tangerine drean to represent this genre. Also try autobahn by kraftwerk, although there are some processed vocals in it.
Gordian Knot's self titled is a modern prog masterpiece.
Liquid tension experiments self titled rules too.