[pycrc home]: https://pycrc.org
[pycrc github]: https://github.com/tpircher/pycrc
[pycrc issues]: https://github.com/tpircher/pycrc/issues
[crc catalogue]: http://regregex.bbcmicro.net/crc-catalogue.htm
[universal crc]: http://mcgougan.se/universal_crc/
[qm github]: https://github.com/tpircher/quine-mccluskey