Ada cross compiler and libraries for AVR µCs
PRTOS is a simple, compact preemptive RTOS for embedded systems
A simulator for Atmel's 8/16-bit AVR microcontrollers
Small real time operating system for AVR and ARM microcontrollers
'Portable WinAVR' , a version that doesn't require an install
Ada compiler support for TI MSP430 processors
C-Library for microcontrollers to control SED1531 based LCD's