A rot13 & rot47 message encodder and decodder.
"rotter" is a linux execuetable compiled using nuitka. "rotter.py" is the source code. And "checksums.txt" contains the hashes for "rotter".
You can run the script using ./rotter. If this does not work the chmod +x rotter then ./rotter should do it. Alternatively you can just do what you would do for python.