NooElec Great Scott Gadgets GreatFET One Bundle - Hi-Speed USB Peripheral, Logic Analyzer, Debugger and Development Board. Open Hardware. Includes GreatFET One, Wiggler, Cable & 120 Prototyping Wires

GreatFET One is a hardware hacker's best friend. With an extensible, open source design, two USB ports, and 100 expansion pins, GreatFET One is your essential gadget for hacking, making, and reverse engineering. By adding expansion boards called neighbors, you can turn GreatFET One into a USB peripheral that does almost anything.
Whether you need an interface to an external chip, a logic analyzer, a debugger, or just a whole lot of pins to bit-bang, the versatile GreatFET One is the tool for you. Hi-Speed USB and a Python API allow GreatFET One to become your custom USB interface to the physical world.
programmable digital I/O
serial protocols including SPI, I2C, UART, and JTAG
logic analysis
analog I/O (ADC/DAC)
data acquisition
debugging
versatile USB functions including Facedancer
high-throughput hardware-assisted streaming serial engine
four fabulous LEDs!