ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.
Open Source middleware platform with FreeRTOS, processor abstraction
uEZ(r) is an open source, embeddded middleware platform providing underlying RTOS and processor abstraction features enhancing portability of application code to multiple ARM and Renesas platforms with high reusability. Developed by Future Designs, Inc. at http://www.teamfdi.com Doxygen docs available at http://www.teamfdi.com/uez/docs/index.html uEZings blog: http://uezings.wordpress.com/ uEZ is now available in a 7-Zip archive in addition to the standard zip file. The 7z download is a much smaller file size. http://www.7-zip.org/ Use 7-Zip to open .7z archive files: https://sourceforge.net/projects/sevenzip uEZ 2.08 release introduces support for LPC4357, the uEZGUI-4357-50WVN-BA, Crossworks 3.6.5 and IAR 7.60 support, SSL support, and more. uEZ 2.09 release introduces support for Ubiquios, µC/Probe, Verizon Cellular, Bluetooth Low Energy, the uEZGUI-35QT, the uEZ-GW1, updated compiler support, and more.