Adafruit Industries's repositories
Tweet-a-Watt
This project documents my adventures in learning how to wire up my home for wireless power monitoring. I live in a rented apartment so I don't have hacking-access to a meter or breaker panel. Since I'm still very interested in measuring my power usage on a long term basis, I built wireless outlet reporters. Building your own power monitor isn't too tough and can save money but I'm not a fan of sticking my fingers into 120V power. Instead, I'll used the existing Kill-a-watt power monitor, which works great and is available at my local hardware store.
LS2208-USB-Barcode-Scanner
Python interface code for the LS2208 - hacky and windows only. YMMV
rgbmatrix-fpga
Adafruit RGB LED Matrix Display Driver for use with FPGAs (written in VHDL)
Cryptosuite
Cryptographic suite for Arduino (SHA, HMAC-SHA)
Adafruit-Resistor-Helper
A papercraft resistor calculator