
77 Million Paintings by Brian Eno
and

Peter Gabriel's explora1 (Can't get this to work on XP)

Mike Oldfield's Tres Lunas
Whenever I think of unique software I keep coming back these three highly-experimental interactive pseudo-games made by UK musicians (I used to hope Jean Michel Jarre would chip in but it's highly unlikely at this point, though admittedly I like his Aero DVD, highly original). There also was the You Don't Know Jack series but trivia games are very mainstream nowadays.
Surely there are more unique interactive experiences out there that cannot be classified as pure games. Maybe innovative screensavers?
