The Atmel AVR microcontroller families provide code-efficient 8 and 32-bit architectures with a nice array of devices and good tool support. The devices offer high performance, lots of peripherals, flash memory, and are available in both single-chip and external memory versions. One really nice aspect of the AVR is that it's been embraced by both hobbyist's and professionals, and there's a comprehensive ecosystem of development tools, software and technical support.
Atmel, as the AVR manufacturer, provides a comprehensive web site with product information, data sheets, samples, and information on development tools and programming software.
- AVR Freaks
The number one AVR community site, with complete information about devices, tools, and applications, plus popular discussion forums.
A web site dedicated to Atmel AVR microcontrollers, with documentation, compilers links, tools links, projects, development boards, news and more.
A series of PODcasts produced by Atmel's AVR design centre in Trondheim, Norway. Episodes contain product demos, trainings, tutorials, and product news.
AVR Development Tools / Boards
- AVRCalc - A free calculator to assist in programming AVR microcontrollers