Johanes Scotus Eriugena, Amalric of Bena, Giordano Bruno, Jakob Böhme, and some would also include Meister Eckhart, Nicholas of Cusa, and Giovanni Mirandola. Hegel and Fichte if you consider those philosophers Christians. Unitarian Universalists could be considered pantheists as could a number of other denominations and historical sects. Outside of the strict Dualist thread of Christiandom, Christianity continually flirts with the notion that God is present in all things, especially humans.