Tarantula Hawk are a strange group, it's difficult to describe them by any means. Most don't use the word space, I chose to because they use a lot of weird synths and keyboards. The whole band is just a drummer, a bassist, and a keyboardist with no vocals. They only have one album out and it doesn't even have any songs listed, just two sides of music with no track breaks. And the last groove of the record loops so you have a hard time telling when it's even over. Very cool, but strange.
Zeuhl is a school of prog that french progfreaks Magma largely started, very jazz based but also choral and chaotic. Again, too difficult to describe.