Caliber is a library for cataloging e-books. Includes library management, eBook viewer and editor, and synchronization features for eBook reading.
Allows you to convert e-books to a dozen different formats and back.
Supports synchronization with almost all e-book reading devices (for example, Kindle, Kobo, Nook).
Can automatically pull news from a range of websites/RSS feeds, format the news into an e-book and download to a connected device.

Dia is a program for creating diagrams, graphs, flowcharts, etc.
There is support for UML static structure diagrams (class diagrams), relationship diagrams, electronic elements, flow diagrams, network diagrams and many others.
Dia includes a large number of graphic elements for drawing various diagrams: block diagrams, electrical diagrams, chemistry, Cisco and others.
Diagrams are saved in XML format (additionally compressed using gzip), and export to JPEG, EPS, SVG, XFIG, WMF, PNG and other formats is also supported. You can import new objects into Dia, which are described in XML files.
Dia is extensible with new sets of objects that are described using files in an XML-based format.