The first versions were open source asking for funding by donations. Although I would have really liked for FEATool to be open source (and I think such as tool would be ideally suited as such), unfortunately not having any form of funding but my personal savings, it was needless to say financially unsustainable (not to say that actually its financially much easier now).

Looks like it's not open source http://forum.featool.com/Queries-about-software-license-td20...

They mention using some open source solvers, so in that sense you could say that the open source COSMOL was already sitting around :)