There are multiple news, discussion and mail groups about Clipper, Harbour and HMG. Surely, if you search, you will find more convenient to your needs. There are also a lot of individual web sites where you can obtain useful information on the subject.
Harbour MiniGUI / HMG is a free / Open Source xBase WIN32 / GUI Development System for Windows platform. By adding this graphical library to Harbour compiler and MinGW, we have now a complete Windows programming tool. In short, Harbour + MiniGUI + MingW is afree Clipper for Windows.
Furthermore this freedom is not about giving up the quality; in contrast, this package has more stability and reliability than many commercial products.
Harbour MiniGUI is aimed to be “natural”. The basic idea lying under it, is to let the programmer to express its ideas in a straight way, using a simple code, easy to write and easy to maintain, making its work more productive. It’s main direction is same as original xBase spirit : being powerful, simple and intuitive.
Harbour MiniGUI license is GPL+”Harbour Exception”, so your use of that executable is in no way restricted on account of linking the library code into it.