Hi
If you don't activate FreeRTOS the Kinetis SDK is "bare-metal" since it just runs in a forever loop.
There are also IAR project I believe in the examples.
See also the uTasker project for an alternative SDK with complete IAR K64 project (rather than various example) and Kinetis chip simulation in Visual Studio. It has a cooperative scheduler, FreeRTOS and bare-metal options (last only recommended for simple projects though and not for TCP/IP, USB stack etc.).
Regards
Mark
[uTasker project developer for Kinetis and i.MX RT]