Evaluation of free UML tools

For a long time now I have been looking for a good & free UML tool that I can use for my personal and non-commercial projects. Recently I finished another survey, which I undertook because I wanted to draw a couple of class diagrams for my open source project Little Go. Unlike my experiences in the past, this time I actually did find a couple of viable tools (see the conclusion), which came as a surprise because, to tell the truth, when I started the survey I didn't have much hope.

Anyway, here I am writing down my findings, possibly for others to read, but also for myself so that I have a starting point in case I ever need to do a future round of evaluation.

About me, this site and the name "herzbube"

About me

My name is Patrick Näf Moser (né Patrick Näf, but that is another story). I live in central Switzerland, near Lucerne, with my wife and no kids, cat nor dog. I earn my living in varying jobs in the computer software business. My personal interests, in no particular order, are computers, reading books, playing games and travelling.

Software Projects

This page lists all software projects hosted on If you want to report a bug, please email me directly. You may also hop over to the Bugzilla page to have a look at issues that have already been reported. Please note that although anonymous users may freely browse the bugs database, they may not enter new bugs, nor is it currently possible to register a new account.