The Nice - Ars Longa Vita Brevis (1968)
Pink Floyd - Piper (1967)
Clouds - Scrapbook (1968) - also worth considering "Up Above Our Heads" (1969)
Fifty Foot Hose - Cauldron (1968)
Monkees - Head (1968)
Small Faces - Ogden's Nut Gone (1968)
Drum Circus - Magic Theater (1969)
Art - Supernatural Fairy Tales (1967)
Spooky Tooth - Spooky Two (1968) (Also worth considering "It's All About" - 1968).
Graham Bond Organisation - There's a Bond Between Us (1965)
Jethro Tull - This Was (1968).
Chrysalis - Definition (1968).
Jason Crest - never released an album, but some of their releases are amazing - check out "Black Mass", B-side of "Place in the Sun" (predates the White Noise piece IIRC).
Pierre Henry - Messe Pour Le Temps Present (1967)
Varese - Poeme Electronique (1958) - Influenced Zappa and Fifty Foot Hose
Stockhausen - Kontakte (1958) - Influenced both Lennon and McCartney.