I've tried to look on this web site as well as to search in google, but couldn't find the source code for the Eclipse Plug-in. It is also unclear under which license it is distributed. The update site contains an (Eclipse p2) content.jar, which only has the default value:
[Enter License Description here.]
I vaguely recall the I've stumbled upon source code once on github, but it is really not simple to find!
Finally, I want to get thethe source code to try to understand why Eclipse plug-in doesn't work for my users. So far, my best guess is a 32bit/64bit mismatch at PlantUML <--> graphviz interface, but I need facts.