I just finished a little tool that converts the plural rules from the CLDR format to the gettext format.
IMHO it's good enough to be used as a common reference, since: 1. It's generated automatically: no human errors ;) 2. When Unicode publish a new CLDR release, it's very easy to keep that tool updated (it's as fast as copying 3 files) 3. The tool implements extensive tests to check its algorithms (all the cases are tested against the examples that comes with the CLDR data itself). You can find this tool here: https://github.com/mlocati/cldr-to-gettext-plural-rules And its html result can be found here: http://mlocati.github.io/cldr-to-gettext-plural-rules/ -- Michele