Just a joke for April Fool's Day, but I believe it can be used in some other way.

The Femto OS is a very concise portable preemptive operating system (RTOS) for embedded devices with minimal ram and flash, say 2KB .. 16KB flash and 128 .. 1024 bytes ram.

This program tries to emulate the sound chip SID of the famous historical C64 Commodore computer (SID = Sound Interface Device). The SID emulator includes all registers of the original SID, only minor functions are not implemented yet.

An open source 8-bit game console (an Uzebox successor)

True random number generator, generated by AVR-based hardware (not a computed pseudorandom numbers).

AVGA is TILE-based AVR interrupt driven audio-video driver for a single-chip game console. Or: It's a great board for developing and prototzping AVR video stuff!

USBTenki is an electronic project to interface sensors to an USB port for collecting weather related data such as temperature.

Arduino Nano is a surface mount breadboard embedded version with integrated USB. It is a smallest, complete, and breadboard friendly. The Nano was designed and is being produced by Gravitech.

EEG: An instrument that measures electrical potentials on the scalp and generates a record of the electrical activity of the brain. Also called encephalograph. Wanna to build your own EEG?

This AVR programmer consists of an ATMega48 or an ATMega8 and a couple of passive components. The programmer uses a firmware-only USB driver, no special USB controller is needed.