Thank you for your interest in our products and for contributing to our community.
To download FreeRTOS:
Go to S32K1 page -> Design Resources -> Software -> S32K1 Reference Software -> Automotive SW - S32K1 - FreeRTOS -> S32K1 FreeRTOS 10.5.1 version 2.0.0
To download RTD:
Go to S32K1 page -> Design Resources -> Software -> Real-Time Drivers for S32K1 -> Automotive SW - S32K1_S32M24x - Real-Time Drivers for Cortex-M -> S32K1_S32M24X Real Time Drivers AUTOSAR 4.4 & R21-11 Version 2.0.0
Please check Release Notes of each SW to see its SW dependencies and installation flow.
I hope this information is helpful.