If you are looking for something different than the traditional Operating Systems for Raspberry Pi 3, then go for the RISC OS Pi. It is not built on Linux and does not support the electronic prototype projects, but it is a whole new concept of OS which works on its own. So, if you are a curious type person and want to play around with your Pi, then you should try this Operating System.

It is based on the BBC Microcomputer Systems and is simpler than the traditional
It has a super responsive USP (Universal Storage Platform)
The minimized version of RISC OS named as RISC OS Pico is suitable for the Pi hackers
You will require a minimum of 2GB SD card to run this OS on your Pi device