Below are some links that I have known and loved.
- Arduino: the ground-breaker that made microcontrollers approachable, and is still relevant today.
- BeagleBone: another small, maker-friendly, Linux-based single-board computer that’s a bit beefier than the Raspberry Pi.
- Raspberry Pi: another leader in the field, helping to integrate inexpensive computers into education and hobbyist projects.
- Reprap: open-source 3D printer community project.
- EEVBlog: great electronics tear-downs, lessons, and rants from a somewhat-opinionated Aussie.
- Hackaday: news and projects in the hacking community.
- Instructables: user-submitted repository of clever DIY projects and hacks.
- Make: publisher of the DIY magazine (plus some well-written books), creator of the Maker Faire, and resource for project ideas and kits.
- Adafruit: huge catalog of maker fixings, and a grand learning database to boot.
- Seeedstudio: maker shop plus custom, small-batch PCB manufacturer. Authors of the Grove sensors and BeagleBone Green.
- Sparkfun: similar to Adafruit with a smaller catalog, but also a wonderful educational resource and more bare components.
- TAPR Open Hardware License: helping to keep tools, projects and creativity free and open to all.