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rtos    

avr-rtos
A Real-Time Operating System kernel for the Atmel AVR microcontroller, incorporating tasks, memory management, semaphores, queues, and other features
preview: http://sourceforge.net  

rtos    

AvrX Real Time Kernel
AvrX is a Real Time Multitasking Kernel written for the Atmel AVR series of micro controllers. AvrX contains approximately 40 API in the following Six categories: Tasking * Semaphores * Timer Management * Message Queues * Single Step Debugging support * Byte FIFO support with synchronization. The Kernel is written in assembly. Total kernel size varies from ~500 to 700 words depending upon which version is being used.
preview: http://www.barello.net  

rtos    

BeRTOS Real Time Operating System - Free RTOS
BeRTOS is a completely free, open source, real time operating system (RTOS) suitable for embedded platforms. Runs on many microprocessors and microcontrollers, ranging from 8 bits to 32 bits CPUs and even PCs. Supports ARM and AVR.
preview: http://www.bertos.org  

rtos    

FreeRTOS - Realtime Scheduler
FreeRTOS.orgTM is a portable, open source, mini Real Time Kernel - a free to download and royalty free RTOS that can be used in commercial applications. Ports exist for many different processor architectures and development tools. Each official port includes a pre-configured example application demonstrating the kernel features, expediting learning, and permitting 'out of the box' development. Free support is provided by an active user...
preview: http://www.freertos.org  

rtos    

XMK - eXtreme Minimal Kernel
XMK is a preemptive multi-tasking kernel for 8bit microcontrollers. Its goal is to provide a bare bones RTOS with a small enough footprint (RAM+ROM) to run on 8bit microcontrollers. Open Source RTOS for 8Bit microcontrollers - Including Hitachi H8 and Atmel's AVR chips.
preview: http://www.shift-right.com