Mappa is a Topic Maps engine. It is compatible with the Topic Maps - Data Model (TMDM) and provides different backends to store topic maps. Further, it provides the import and export of different Topic Maps syntaxes.
tinyTiM (the tiny Topic Maps engine) is a small
and lightweight implementation of the Topic Maps API (TMAPI).
TMAPIX is a collection of Java libraries that
provides comfortable access to TMAPI-compatible
Topic Maps engines. Beside several utility
classes, it provides libraries to build and query
A calendar application for Mozilla-compatible mail clients.
A CORBA C++ ORB.