FuzzyAHP is an R package to calculate AHP and fuzzy AHP. The package is available from CRAN and source code from GitHub. There are two vignettes available with the package, the first one with main information and the second with examples.
The package is designed to respect the utilization of AHP and fuzzy AHP in geoinformatics and other fields working with spatial data. There is an article associated with the package: Comparison of Fuzzy AHP Algorithms for Land Suitability Assessment.