You can download TerraGo Composer 6.6.1 from our software library for free. This tool was originally created by TerraGo Technologies. The most popular versions of the tool 6.0 and 5.6. The program lies within Photo & Graphics Tools, more precisely Viewers & Editors.
From the developer:
TerraGo Composer gives organizations the power to easily create, edit and dynamically update digital maps, images and GeoPDF MapBook products, simply and cost-efficiently. With GeoPDF MapBook, anyone with access to Adobe Reader can leverage the TerraGo Toolbar to use and update geospatial data in the field.
You may want to check out more software, such as TerraGo Publisher for ArcGIS, FlexiMusic Composer or MidiNotate Composer, which might be related to TerraGo Composer.