According to this page: https://software.intel.com/en-us/articles/intel-system-studio-release-notes#usage
Intel System Studio Works on the Following O.S: Android*, Linux*, Embedded Linux*, Yocto Project*, Wind River* Linux* and Windows*
There is no mention of uCOS operating system.
Regarding your second question, according to the FAQ:FAQ for Intel® System Studio | Intel® Developer Zone
What type of developers need Intel System Studio?
- Highly optimized compiler technology helps developers to obtain a performance gain through re-compilation. Intel® C++ Compilers are source and binary compatible to GCC*, and Microsoft* Compiler
- Advanced performance libraries help to build performance demanding code and applications based on thousands of library functions covering signal, image, data processing and math functions
- Various CPU/GPU performance analyzers and energy profiler to identify performance hotspots in code, or code that causes higher power consumption
For more information regarding the Intel System Studio I recommend the following support channel: https://software.intel.com/en-us/forums/intel-software-development-products