Maybe many people have already gotten this news. I just read this from a Simplified Chinese web-site.
Open/Free ARM Cortex M3 Development Tools:
www.coocox.org/index.html
CooCox Colink
CooCox Colink is a small ARM Cortex M3 JTAG hardware debugging probe. It integrates seamlessly into IAR Embedded Workbench, Keil RealView MDK, CooCox CoDebugger and CooCox CoFlash.
CooCox CoOS
CooCox CoOS is a mini embedded RTOS specially for ARM Cortex M3. It is a real-time multi-task kernel which conforms to CMSIS ( Cortex Microcontroller Software Interface Standard ).
CooCox CoBuilder CooCox CoDebugger CooCox CoFlash