- ifixit.com – Free repair guide for everything, written by everyone.
- Royal Institution – Science games and lectures.
- Curiosity Cabinet – Short Videos that demonstrate Scientific Principles.
electronic
- Basic Electronics – Instructables
- Design Museum – London
- GitHub – Code repository
- Mouser Electronics – Electronic components.
- Resister Color Code Calculator – by DigiKey
arduino
- Arduino – Open-source electronics prototyping platform.
- Netduino – Open-source and connected platform.
- Mechatronics – Arduino tutorials.
- Arduino Create – Online Sketch, etc.
raspberry pi
- Raspberry Pi – Official Raspberry Pi site
- The MagPi – Magazine for all things Raspberry Pi
- Pi Weekly – Online Pi Newsletter
- Pi Map – Interactive map of parts on the Pi