Dragon-drop is a simple drag-and-drop source/sink for X or Wayland.

Many programs, particularly web applications, expect files to be dragged into
them now. If you don't habitually use a file manager that is a problem.
Dragon-drop is a lightweight drag-and-drop source for X where you can run:

    dragon-drop file.tar.gz

to get a window with just that file in it, ready to be dragged where you need
it.