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The main advantages are:
Small memory footprint (~ 4kB of RAM)
Sensors support
Preemptive scheduling
Dynamic memory allocator
Kconfig feature selection tool
Apart from these, you can start building features ahead of hardware by using the simulator target. This enables you to build a user space process running on the host machine (either Linux or MacOS) that runs the Calypso OS simulation. This build has simulated interrupt support and acts like real hardware and you can leverage the powerful host debugging tools from your computer.
If you don't have a hardware board don't worry. You can start using the simulator config target or the versatilepb which is using QEMU. This target versatilepb has limited support (only the console print is working for the moment) but further support should be added in the near future.
Download the sources with git clone and update the submodules for this project:
git clone https://github.com/sebastianene07/calypso_os.git
git submodule update --init --recursive
For simulator build:
make config MACHINE_TYPE=sim
make
After the build finishes it outputs build.elf which can be run on your host as an executable:
./build.elf
Another good starting point if you want to play with the QEMU sources is to fetch my branch and build the NRF52 machine support that I've added.