AgreeStat/360: computing weighted agreement coefficients (Conger's kappa, Fleiss' kappa, Gwet's AC1/AC2, Krippendorff's alpha, and more) for 3 raters or more
How to Calculate Fleiss' Kappa in Excel? - GeeksforGeeks
Cohen's Kappa: Learn It, Use It, Judge It | KNIME
Cohen's Kappa | Real Statistics Using Excel
Cohen's Kappa | Real Statistics Using Excel
Inter-rater agreement (kappa)
Fleiss Kappa for Inter-Rater Reliability | James D. McCaffrey