Wind Energy

WhalePower: Increases blade efficiency with bumps on the leading edge (biomimicry inspired by humpback whales).
Ti'éole: Helps you to build a wind turbine yourself, for your own garden, with cheap material.
wind engine using boat sails: The sails moved around a fixed vertical axis. Free technology. In French.
boat sails prototype: Video in French of a prototype using boat sails that still works with very little wind.
Enercon: They have developed a "direct-drive" system with a generator that can operate at low rotational speeds and does not require a gearbox (gearboxes are exposed to lots of vibrations and movements inside the turbines). However, such generators are very heavy and tend to be more expensive.

Clipper Windpower: They are building a 7.5 MW offshore prototype (as of December 2008).