plantuml — A Java Tool for Quickly Write Diagrams
calabash = com.xmlcalabash.drivers.Main
plantuml [options] [-gui]
or:
plantuml [options] [file1/dir1] [file2/dir2] [file3/dir3]
See PDF file file:///usr/share/doc/packages/plantuml/PlantUML_Language_Reference_Guide.pdf for more information.