ChibiOS/RT 2.0.6 has been released. This new stable release fixes some minor bugs in the 2.0.x branch and brings performance improvements in the threads creation benchmark.
This efficient embedded RTOS supports multiple architectures like ARM7, ARM Cortex-M0, ARM Cortex-M3, MegaAVR, MSP430, Power Architecture, STM8 and others. A matrix of all the implemented features is available here.
ChibiOS/RT is licensed under the GPL with a linking exception allowing commercial applications.