Olympos is an holistic MDA/MDD approach to projects. It allows to create Web (PHP, J2EE), Desktop (c#) and Mobile applications (.NET, J2ME) from a UML model. Features a Web 2.0 IDE, a generator based on openArchitectureWare and several cartridges.
...The tool has a simple special syntax in order to spell out ordered/ un ordered lists under each section of a use case.
All such use cases can be saved in a work space and exported to PDF after arranging the usecases in your requried order (Images are resized to fit the page).
This is a pure Java application using simple File I/O.
Xuse manages requirements, use cases & other artefacts that drive software design. Xuse focuses on clear documentation & communication. It defines an XML data model for requirements & use cases with XSLT providing multiple derived views: HTML/SVG/PDF.
Note there is no GUI for entering requirements, however another project (https://sourceforge.net/projects/xguse/) will provide a GUI.