Especially powerful is the LCL (Lazarus component library) a GUI wrapper library which makes it possible to "write once compile everywhere" (Slogan of Lazarus).

Especially powerful is the LCL (Lazarus component library) a GUI wrapper library which makes it possible to "write once compile everywhere" (Slogan of Lazarus). An in difference to QT or gtk and such toolskits it looks native on every platform because in the backend LCL can use GTK, GTK2, QT, Win-API or in this case MUI to create the GUI, so the application look not like aliens but native.