IMPORTANT: yUML is a Ruby on Rails app, and requires some expertise to install. We recommend that it is only attempted by people who know Ruby, Rails and Linux well. People who aren't afraid to compile/install Linux packages.
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And also says "We can offer help setting up the server and installing yUML for a fee"
But, I think that providing a virtual box virtual machine with a full yUML Configuration embebded would be great for possible customer like me.
Is just an idea ;)
Have a nice year.