These are plugins for Dia to generate code from UML state machine diagrams. Currently 'text' and 'c' generation is implemented. Adding code generation for other languages should be trivial.
The plugins are based on code by Unai Estébanez Sevilla.
You need to copy those plugins to ~/.dia/python and will then be able to generate code via File->Export->the respective plugin
There's a blog post explaining the code of the plugins here.
Tomas Pospisek, email@example.com