Bearingnet
- An online sourcing system for rare, unusual, and surplus ball bearings from many distributors worldwide
- http://www.bearingnet.net

The Gear Industry Home Page
- Gear Technology magazine's online information source, with a directory of gear manufacturing services, including gear machine tools, cutting tools, heat treating and custom gear manufacturing.
- http://www.geartechnology.com

The Power Transmission Home Page
- Product information, specifications and links to hundreds of manufacturers and distributors of gears, motors, bearings, speed reducers, actuators, drives, sensors, and other mechanical and electrical power transmission components.
- http://www.powertransmission.com