Hello guys!
Here is a free drag and drop system for a GUI - you can add some more functions if you need it for your game project!
Thank you, enjoy it.
BGE - Version: https://www.dropbox.com/s/e0hc7fw7hmosafn/dragAndDropSystem_for_BGE_by_ChaosfuchsGameDev.blend?dl=0
UPBGE - Version: https://www.dropbox.com/s/i3ck90h65guumdg/dragAndDropSystem_for_UPBGE_by_ChaosfuchsGameDev.blend?dl=0