Shortcut for showing windows instead of clicking the Dock
This works for some applications but not for all. You can use TextEdit.app to test it.


Open TextEdit.app
Create a new document (CMD+N).
Minimize the document (manually, CMD+M did not work for me).
CMD+Tab to Finder.app


Now everything's set up. The following steps may be a bit tricky.


CMD+Tab to highlight TextEdit. Keep the CMD key pressed.
Keep the CMD key pressed and additionally press the Alt/Opt key.
Release the CMD key.


This will un-minimize only the last window of a certain application. You cannot un-minimize multiple windows without additional scripts/software.