The library and the associated Designer tool are FreeWare (though they are not crippled in any way):

You can use them without time limitation and you can create FreeWare applications, with no fee to the author.
Notice however: any program using this FreeWare version of MGui cannot be used for commercial or any other profit purpose.

In order to make commercial use of any program created with MGui, please contact the author to buy a commercial license.

MGui sources are NOT available for free to users.
A source license can be obtained from the author under certain limitations. Please contact the author for details on the license fee.

MGui has been designed and developed entirely by:
Vincenzo Morello, born in 16 Apr 1962 in Licata (Italy),
graduated in Electronic Engineering.