UMich Plasmadynamics & Electric Propulsion Laboratory (PEPL)
The Plasmadynamics and Electric Propulsion Laboratory (PEPL) at the University of Michigan.
http://www.engin.umich.edu/dept/aero/spacelab/

Electric Space Propulsion
Research carried out by the Institute of Space Systems. Also contains a good overview of the various types of electric propulsion.
http://www.irs.uni-stuttgart.de/RESEARCH/fe_f200e.html

Aerospazio Tecnologie
Research and development company focusing on space simulation, spacecraft, electric rocket propulsion technology, electromagnetic plasma diagnostics and electric thrusters EMI/EMC testing under vacuum.
http://www.aerospazio.com

Electric Propulsion and Plasma Dynamics Laboratory
Research in electric propulsion, plasma thrusters and fundamental problems in plasma physics. Princeton University.
http://alfven.princeton.edu/

Electric Propulsion and Plasma Dynamics Laboratory
Research in electric propulsion, plasma thrusters and fundamental problems in plasma physics. Princeton University.
http://alfven.princeton.edu/

AC Propulsion, Inc.
Manufacturer of battery and propulsion systems for electric vehicles.
http://www.acpropulsion.com/

Gyroscopes As Propulsion Devices
Gyroscopes have many uses, this site explains how a gyroscope works and what they can be used for. The site also looks at the possible uses of gyroscope based propulsion (gyroscopic propulsion).
http://www.gyro-scope.co.uk/

Solomon Technologies
Solomon Technologies is a Manufacturer of Electric Propulsion Systems for the marine and land based vehicles, and has a Power Electronics Division that manufacturers High power DC supplies.
http://solomontechnologies.com

Seaeye Limited
Specialists in the design and manufacture of Remotely Operated Vehicles (ROV)
http://www.seaeye.com/

Centrospazio
A space technology research laboratory specialized in Electric Propulsion development and testing: Hall thrusters, FEEP systems, MPD thrusters, arcjets.
http://www.centrospazio.cpr.it