I'm sure a lot of you will have heard of or know of Winteracter. It's a graphics and GUI toolset. It's a very mature system and has been around for a long time. I can remember the Fortran 77 version! Lawson Wakefield, its author, has stopped selling Winteracter but has offered free unsupported licences to anyone who wants one.
Visit here: https://www.winteracter.uk/licrequest.php
-- Admin Silverfrost Limited