>>
>>Using GIT you can load all your different locations into separate branches, and then merge each branch one after the other doing diff compares between each. There's a $5 tool called Stash by Atlassian ( https://www.atlassian.com/software/stash/overview ) which is a personal GitHub-like website where you can set it up on a local Linux server and run it. You can do all your coordinating there graphically, then get the latest, zip up the content, and put that into source control management somewhere else if you want.
>>
>Interesting... Is there some toolset to group branches according to similarity to perhaps get some idea of heritage ? Thinking of simple tools like cluster analysis at the moment, but ideas from genome matching might even work better.


Not to my knowledge. There are surely such tools though. Git analysis tools are becoming much more prevalent as time marches on.