Many projects using microcontrollers (AVR, ATMega8, ATmega163, ATtiny12, ATtiny2313, AT90S1200A, AT90S2313, AT90S8515/ATMEGA8515), analog, RF, and all 3 mixed; much free information.
Makes CodeVisionAVR C compiler, integrated development environment (IDE), automatic program generator, ChipBlasterAVR in-system programmer, code wizard, for Atmel AVR processors. [commercial]
Suite of executable software development tools for Atmel AVR RISC processors, hosted on the Windows platform, has GNU GCC compiler for C/C++. Open source.
Many projects: accelerometer, 5-digit frequency counter, temperature controller, chatboard conversion, precise Direct Digital Synthesis sinewave generator, uC/OS-II RTOS port, digital guitar tuner, MP3 players, add very large DRAM on small CPUs.