The Direct Fusion Drive (DFD) is being researched and developed by Princeton Satellite Systems.
Direct Fusion Drive for Space Propulsion and Power
The Direct Fusion Drive rocket engine (DFD), based on the Princeton Plasma Physics Laboratory’s Princeton Field Reversed Configuration machine, will enable human missions to the planets, advanced robotic missions, mission to interstellar space and to nearby solar systems. The same system can be used for propulsion and power. The engine is based on the Princeton Plasma Physics Laboratory Field Reversed Configuration invented by Dr. Samuel Cohen.