• TMAPI - ​http://www.tmapi.org/ - TMAPI is a programming interface for accessing and manipulating data held in a topic map.
• ​http://www.ontopia.net/topicmaps/materials/tao.html - The TAO of Topic Maps.
• ​http://www.wandora.org - Wandora is a general purpose information extraction, aggregation, management, and publishing application based on Topic Maps and Java.