Well, there is
-A Water Power Wheel (A large wheel next to rivers used to power most independent farms)
-A water Channel Turbine ( Similar to Power Wheel but is much more compact and is man made, instead of a river, it's a chute next to dams or solar Continental plants)
I have more but those are the most common ones.
- Waterwheels, used for hundreds of years to power mills and machinery
- http://wiki.answers.com/wiki/Hydroelectricity, usually referring to hydroelectric dams, or run-of-the-river setups (eg hydroelectric-powered watermills)
- http://wiki.answers.com/wiki/Damless_hydro, which captures the kinetic energy in rivers, streams and oceans
- http://wiki.answers.com/wiki/Vortex_power, which creates vortices which can then be tapped for energy
- http://wiki.answers.com/wiki/Tidal_power, which captures energy from the tides in horizontal direction
- http://wiki.answers.com/wiki/Tidal_stream_power, which does the same vertically
- http://wiki.answers.com/wiki/Wave_power, which uses the energy in waves
- http://wiki.answers.com/wiki/Osmotic_power, which channels river water into a container separated from sea water by a semipermeable membrane.
- http://wiki.answers.com/wiki/Marine_current_power which captures the kinetic energy from marine currents.
- Ocean Water Thermal Conversion which exploits the temperature difference between deep and shallow waters.
