dos ui Graphical User Interface for DOS lib

 http://www.mevis-research.de/~ritter/awakeideas/desktop.html
DESKTOP is a graphical user interface for DOS, which ones used to be a commercial shell like MS-Windows™ 3.0 or GEOS™. However, due to the dominance of MS-Windows 95, we were forced to stop publishing the program, so it's free now…

https://en.wikipedia.org/wiki/FreeDOS
https://stackoverflow.com/questions/28147612/how-to-create-dos-unix-like-gui
https://copyprogramming.com/howto/how-do-you-build-a-gui-shell-for-dos
https://retrocomputing.stackexchange.com/questions/14375/c-c-ui-library-similar-to-visual-basic-for-dos
https://news.ycombinator.com/item?id=36108486

https://github.com/jacobpalm/costa
https://github.com/ernstc/Golib
https://sourceforge.net/projects/dosgui/

https://www.bttr-software.de/freesoft/desktops.htm

http://www.webabode.com/software/gui_for_dos.html

DJGPP  GUI  library
https://docs.blender.org/api/intranet/docs/develop/ui/crystalspace.html
http://www.deleveld.dds.nl/depui33/library.htm


https://www.desy.de/user/projects/C%2B%2B/products/zinc.html