So greeNsort® is software?
No, greeNsort® is about software algorithms. Of course those algorithms are tested and verified in software, but the software in the greeNsort® testbed is optimized for fair scientific comparison with prior art algorithms. It is not optimized for a particular purpose, programming language, compiler or hardware. The C-code aims on equal implementation quality of all compared algorithms and it contains code needed for measurement. It does not contain code needed in production environments such as special treatment of NULL or NA values, error handling or options for users to interrupt long running tasks.
The value of a prototype is in the education it gives you, not in the code itself
— Alan Cooper