Arduino Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs – light on a sensor, a finger on a button, or a Twitter message – and turn it into an output – activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board.
Raspberry Pi A Raspberry Pi is a credit card-sized computer originally designed for education, inspired by the 1981 BBC Micro. The Raspberry Pi is slower than a modern laptop or desktop but is still a complete Linux computer and can provide all the expected abilities that implies, at a low-power consumption level.
Parallax Parallax believes in the genius in everyone. Whether a simple project or an intricate invention, they provide electronic hardware, software, and tutorials to amplify your potential. Equip your genius.
embedded fm Embedded is the show for people who love gadgets: making them, breaking them, and everything in between. Interviews with engineers, educators, and enthusiasts.
The Amp Hour An off-the-cuff radio show and podcast for electronics enthusiasts and professionals. Featuring Chris Gammell and Dave Jones.
hackaday Hackaday serves up Fresh Hacks Every Day from around the Internet. Their playful posts are the gold-standard in entertainment for engineers and engineering enthusiasts.
ee web EEWeb is a premier electrical engineering community that strives to offer its members the best online resources for hardware designers. EEWeb offers the ability to build a profile, search job listings, upload projects, Electronics Forum, etc.
Digikey Digi-Key Corperation is a large distributor of electronic parts and tools. You can find just about anything here. When looking for a part it is a good idea to check here along with Jameco & Mouser.
Jameco Jameco Electronics is a large distributor of electronic parts and tools. You can find just about anything here. When looking for a part it is a good idea to check here along with Digi-Key & Mouser. 
Mouser Mouser Electronics is a large distributor of electronic parts and tools. You can find just about anything here. When looking for a part it is a good idea to check here along with Digi-Key & Jameco. 
bg micro B.G. Micro is a surplus distributor with a unique twist. Not only is the editor of their catalog a pretty funny guy, but they often provide technical data for some parts that other surplus vendors wouldn’t bother with. This gives them an edge on certain items as there are often others who may carry similar interesting parts, but without data it often comes down to who has the info. 
all electronics All Electronics Corporation is a surplus distributor that has a pretty good selection of parts. As with any surplus distributor, items you find here may be a one time buyout and never be available again. 
electronic goldmine Electronic Goldmine is a surplus distributor that has a pretty good selection of parts. As with any surplus distributor, items you find here may be a one time buyout and never be available again. 
think geek Stuff for smart masses. I sometimes find stuff here to hack.