TMNav 0.2.7 was released in January 2004.
It introduced the following features
Refined collaboration of Abstractors and Renderers.
Integration of TMHarvest.
Supports execution of Tolog-queries.
Improved userdoc.
Added a third Renderer, the Section Renderer.
As alway, improved user interface.
TMNav 0.2.5 was the second public release of TMNav.
It introduced the following features:
Improved GUI, using Menus and Dialogues and Icons for Topicmap Objects
Supports Merging
Supports LTM-Notation
Added Tree Renderer
For a more complete descriptions of changes have a look at changes.txt