...These views show selected elements and their relationships.
crystal_facet_uml keeps element names and element hierarchies consistent.
This tool runs on your local PC.
It stores the model data in a json-based file which can be versioned in git, branched and merged together with your source code.
crystal-facet-uml exports diagrams as svg, pdf, ps, png or the complete model as DocBook, html, json or xmi.