Fleiss Kappa for Inter-Rater Reliability | James D. McCaffrey
AgreeStat/360: computing weighted agreement coefficients (Fleiss' kappa, Gwet's AC1/AC2, Krippendorff's alpha, and more) with ratings in the form of a distribution of raters by subject and category
How to Calculate Fleiss' Kappa in Excel - Statology
Fleiss' kappa statistic and corresponding agreement | Download Table