FuzzyAttributes is a QGIS plugin that converts numerical or categorical attributes into fuzzy values (membership degrees between 0 and 1) according to several types of membership functions: linear increasing/decreasing, trapezoidal, triangular, sigmoid (S and Z), and Gaussian.
The graphical interface makes it easy to configure the parameters for each function, displays a visual example of the transformation, and provides built-in help to understand each type of fuzzy function.
The plugin also allows fuzzy aggregation of multiple criteria using parameterized methods, with consistency checks and warning messages in case of conflicting configurations.