The GUI (Graphical User Interface, basically what you see on the screen) of PMF uses the Qt library, which is released under the GPL.
The rest of the code (the stuff I wrote) is released under the GPL. This means that you can download and use PMF for free, even in commercial settings, provided you respect the conditions of the GPL.
If you have no idea what GPL, FOSS or Free Software means, you may want to ask your preferred search engine.

See Installation for instructions on how to set up your system(s) to access DB2 and/or SQL Server via PMF.

Current version

PMF 5.1.25

Previous versions

PMF 5.1.24
PMF 5.1.23