If you wanted an easy way to group monsters by basically any tags they have (Horde, Messy, Organized, etc.), here is a google spreadsheet I made. I made a “Combat Level” (CL) classification. Use it if you like it!
https://docs.google.com/spreadsheets/d/1w-tnlySP7pdcNcBZmK6d7udV6JqccicoMMLjA1f6A64/edit?usp=sharing
Suggestions and comments welcome!
[EDIT : I modified the link to lead to the last version of the spreadsheet with the CL. The older link won’t work.]