arm.com's Documentation
GNU ARM toolchain
Martin THOMAS's ARM-Projects
Accessing ARM-Controllers with OpenOCD
OpenOCD - Open On-Chip-Debugger
OpenOCD's documentation - including JTAG hardware dongle, JTAG commands, GDB and OpenOCD, etc.
devkitPro - the toolchains of choice for homebrew game development, currently available for GameBoy Advance, GP32, Playstation Portable and GameCube. More platforms will be added as time permits.
devkitPro's files list in sourceforge.net - especially dswifi.
