Hi,
I understand your concern and it's good to be suspicious, but this software is only available as windows-application for the moment. It's open source though, so you can check everything what the software does or even compile it yourself. If you don't understand the programming language that's no gain for you, but you may trust people that understand it that it will do no harm.
Recently I saw a similar project (at least for the managing-/library-part) that is completely on a website, maybe you like this more: