Moresophy - Offers the tool set L4 Semantic NetWorking which is an integrated and scalable solution for structuring and integration of electronic sources of knowledge using semantic networks and offering full XTM support. Ontopia's Omnigator - Omnigator is a free downloadable topic map navigator, powered by Ontopia's engine. TM4J - An open source toolkit written entirely in Java. Includes a parser, data model, in-memory and persistent storage mechanisms and a query engine. TMAPI - Common Topic Map Application Programming Interface is a collaborative effort to define an API for topic map applications. Topic Map Designer - A free tool for design, edit, browse and view of small-size Topic Maps. tinyTIM - A very small and easy to use in memory Topic Map engine, implementing the TMAPI interfaces. TMNav - A Java application for browsing topic maps.