The document discusses various tools for natural language processing of Russian text, including Mystem, Snowball, Gate, AOT, and WordNet. Mystem and Snowball are open-source morphological analyzers. Gate is an open-source framework for natural language engineering that includes plugins for Mystem and Snowball. AOT is a commercial platform for Russian, English, and German that includes modules for grammar analysis, morphology, and interfaces for demonstrating module functionality.