This GPIO Pinout is designed to be both a quick and interactive reference to the Raspberry Pi GPIO pins, plus a comprehensive guide to your Raspberry Pi's GPIO interfaces. It also includes dozens of pinouts for Raspberry Pi add-on boards, HATs and pHATs.
Kit Space (formerly called Kitnic) is a registry of open hardware electronics projects that are ready for you to order and build. It could be described as a "Thingiverse for electronics". Click on any project to get further info, download the Gerbers and see the bill of materials.
Click once, order everything.
A 100% compatible replica of the famed SB 1.0 sound card. 8-bit ISA card. Full bill of parts. Even has a hex dump which turns an Atmel 89S51 into an 80C51 DSP chip (if you don't feel like buying one from China).
A directory of known Arduino shields.
A page that talks about passive and active sonar sensors. Security uses, especially the seismics. Links to other books and DoD video footage. I think this would be useful for training as well as surveillance applications.
A monthly subscription box of hacker stuff to build and experiment with.
The homepage of Charles Stross.
art artists blog culture design electronics events film hacking hardware industrial military performance robotics science video technology
A site that sells replacement parts for laptops, including LCD screens.
Repairs that you can carry out at home on bricked iPods.
Count Zero's article on magstripe reading/writing reprinted in the sci.electronics FAQ.
A cheatsheet for the most popular microcontroller chips' pinouts, connection headers, and cable pinouts.
This is a thing of beauty.
A wiki of designs, schematics, and links to open source electronics projects. If you get lost in here long enough you'll find some interesting stuff.
A suite of open source electronic design tools. Uses a GUI for schematic capture. Also capable of analog and digital simulation, generation of parts lists and export of PCB designs for fabrication.
A list of tricks and methods for optimizing code written for the ATmel microcontrollers using GNU GCC.
Fritzing is an open-source graphical application for converting a project prototyped with an Arduino into a PCB schematic for manufacture. Designed for people already familiar with Processing to do what they need to do easily. Cross platform: runs on Windows, OSX, and Linux.