AVR

Alberto Ricci Bitti Page
Award-winning electronic designs, circuit diagrams, ready-to-use schematics, source code; mainly for microcontrollers by Atmel (AVR), and PIC.
http://www.riccibitti.com/

Atmel AVR
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/Atmel_AVR

The Atmel AVR Forum
Many topics: beginners help, Assembly, BASIC, C; projects, technical and hardware; commercial issues; robot car and motor control; computer math.
http://avr.15.forumer.com/

ATtiny.com: AVR Microcontroller Projects
Many projects; much free information: hex dumps and software, full programs, ASM examples, Manchester code, bi-phase code; tutorials, instructions, tips, tricks, datasheets, diagrams. English, Nederlands.
http://www.attiny.com/

The AVR Assembler Site
Descriptions, tutorials, many code samples: application notes with commented source code.
http://avr-asm.tripod.com/

AVR Butterfly and Beginners Site
The Butterfly is a credit-card sized demo board from Atmel Corp. It is feature-dense and low cost. Descriptions, tutorials, forum, block diagram, primer, many code samples: application notes with commented source code.
http://retrodan.tripod.com/

AVR Core: Overview
Description of open source AVR clone, coded in VHDL; core compatible with ATmega103, has same instruction set and timing with few exceptions. Opencores.org.
http://www.opencores.org/projects.cgi/web/avr_core/overview/

AVR Freaks
News in Weblog format, links, forum, tutorials, articles, specifications; devices, tools, projects, vendors. Some areas need registration.
http://www.avrfreaks.net/

AVR Libc
Goal: high quality C library to use with GCC on Atmel AVR microcontrollers. Together, avr-binutils, avr-gcc, and avr-libc are the core of the open source toolchain for AVR.
http://www.nongnu.org/avr-libc/

AVR Microcontroller Projects
Many projects, tutorials; tools, book list, photo gallery, links.
http://www.avrprojects.net/

AVR Projects
Many projects: servocontroller; MIDI keyboards, splitter; programming adapter, starlight simulator, infrared-RC5 interface, robotics. English, Nederlands.
http://www.dertien.dds.nl/content/avrprojects.html

AVR-Assembler-Tutorial
Introduces assembly programming language for Atmel AVR processors (AT90S) with practical examples. English, Deutsch.
http://www.avr-asm-tutorial.net/

AVRButterfly: AVR Butterfly and Beginners Group
Email forum at Yahoo Tech Groups.
http://tech.groups.yahoo.com/group/avrbutterfly/

BASCOM AVR Tutorial
For BASIC compiler for writing software on Windows to download to Atmel 8-bit controllers; easy to learn and use, low cost. Introduction, downloading, installing, configuring, sample program with screenshots. Candle Automation, Ltd.
http://www.candleautomation.com/programminglanguages/bascomavr/

BelliBot
Documents robot that uses AVR processors; photographs, circuit layouts, description in German.
http://www.bellibot.com/

Dick Cappels' Project Pages
Many projects using microcontrollers (AVR, ATMega8, ATmega163, ATtiny12, ATtiny2313, AT90S1200A, AT90S2313, AT90S8515/ATMEGA8515), analog, RF, and all 3 mixed; much free information.
http://cappels.org/dproj/Home.htm

ECE476 Final Projects
Many electrical engineering student projects, using Atmel ATmega32 AVR chips. Cornell University.
http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/

Electrons: Articles: AVR
Articles on varied aspects of AVR use. Psychogenic, Inc.
http://electrons.psychogenic.com/modules/arms/sec/1/AVR/

A GNU Development Environment for the AVR Microcontroller
Document on many details of GNU tools for AVR class processors.
http://users.rcn.com/rneswold/avr/

HP InfoTech S.R.L.
Makes CodeVisionAVR C compiler, integrated development environment (IDE), automatic program generator, ChipBlasterAVR in-system programmer, code wizard, for Atmel AVR processors. [commercial]
http://www.hpinfotech.ro/

Jesper's AVR Pages
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.
http://www.myplace.nu/avr/

Linux Development Tools for Atmel AVR
Tool chain development for AVR on Linux: programmer hardware, Linux driver, AVRASM-compatible assembler/linker, debugger, simulator. Theiling Online.
http://www.theiling.de/avr.html

MCS Electronics
Makes BASCOM AVR/8051 Windows BASIC compiler, educational development board, with tutorials, forum; other embedded electronic systems.
http://www.mcselec.com/

Procyon AVRlib: C-Language Function Library for Atmel AVR Processors
Descriptions, documents, downloads.
http://hubbard.engr.scu.edu/avr/avrlib/

ScienceProg
AVR tutorials, projects, links; and other science, embedded, biomedical engineering, physics content.
http://www.scienceprog.com/

SCU Robotic Systems Laboratory: Embedded Systems Resources
AVR resources: beginning, installing, hardware, motor controllers, links, courses using AVR processors, downloads; ARM hardware and tools.
http://hubbard.engr.scu.edu/embedded/

Smiley Micros
AVR consulting and related products: C programming book, Butterfly development kit, projects kit, Butterfly carrier; downloads, testimonials.
http://www.smileymicros.com/

WebRing: AVR
Set of links to websites on Atmel AVR microcontrollers, related projects.
http://www.webring.com/hub?ring=avr

WinAVR
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.
http://winavr.sourceforge.net/