/nordic/nordic-blog/b/blog/posts/now-ucxpressonrf-provides-the-free-evaluation-liceuCXpresso.NRF is a RTOS C/C++ Framework, Features: Develop on Mac OS/X, Linux and Windows with LPCXpresso IDE (free). Multi-Tasking RTOS supported Enhanced BLE C++ framework Tickless Low Power technology ready. Activity avg. @ 26uA (Min. 6en-USTelligent Community 13