- Ultralight cycling
- Composiet Forum Dutch
- Modelbouwforum Dutch
- Hobbyelektronica Informatie voor elektronica hobbyisten
- pveducation. Extensive information about solar energy, theory and practice
- DESERTEC Making use of solar energy in the deserts worldwide
- SolarPlaza. Solar news
- GoGreen. News about green living, climate & weather, energy & power etc.
- electricbike.com News, reviews, technical information and many images:
- ebikes.ca Spoke length calculator, hub motor simulator etc.
- kreuzotter Speed & Power calculation etc.
- All About Circuits. A very extensive website about electronics
- Electrical engineering community with design tools, projects, articles, jobs, events, etc.
- PCBWeb A free CAD application for designing and manufacturing electronics hardware.
- Series and parallel resistor calculator
- SMD resistor code calculator
- EEweb Germany Electronics and electrical engineering community