HyperGraphDB is an open-source graph database designed for complex knowledge representation and reasoning. Unlike traditional graph databases, it employs a generalized hypergraph model that allows for the representation of higher-order relationships beyond binary relationships. This capability makes it well-suited for applications in artificial intelligence, data mining, and other fields that require complex data structures. HyperGraphDB is implemented in Java and is built to be highly customizable and scalable, enabling users to tailor it to specific domain needs.