The FuzzyLite Libraries for Fuzzy Logic Control. QtFuzzyLite 6 is (very likely) the best application available to easily design and directly operate fuzzy logic controllers in real time. fuzzylite is a free and open-source fuzzy logic control library programmed in C++ for multiple platforms (e.g., Windows, Linux, Mac, iOS). jfuzzylite is the equivalent fuzzylite library for Java and Android platforms.