Proto Pasta http://www.proto-pasta.com/] - carbon fiber reinforced PLA, high temp PLA ( 190C-210C ), PC-ABS alloy
Matter Hackers- Taulman 618 Nylon, soft PLA, TPE is a flexible 3D printing material that feels and acts much like flexible rubber, HIPS, PC and all whole range of Kai Parthy’s LAY-WOOD3 and Lay brick -- on the way from Kai - Lay ceramic - LAY-FELT, LAY-TEKKKS, LAY-FOMM, GEL-LAY . LAY-FELT and LAY-TEKKKS are similarly felt-like materials though LAY-TEKKKS is thinner and more fibrous. LAY-FOMM and GEL-LAY are foamy and gel-like respectively.
AveroLabs - PEEK, carbon fiber and carbon nanotube reinforced, PPSU, PEI. In order to use such materials it’s necessary to have a printhead that can handle up to 400º C.
3DX Tech - MI startup has ABS-nylon , ABS+carbon nanotubes, 3DXMax HIPS support material. This can be used for multi-headed 3D printers to create support structures dissolvable in d-Limonene, for easy clean up
Esun - conductive (129 ohm/cm), luminous, wood, flexible, cleaning and alloys including PLA/PC, PLA/ABS, PLA/POM and PLA/HIPS
ECO Reprap - Conductive PLA, Flame Retardant PLA,PC/ABS,TPEE,PEEK and PP