Available from Plugin Manager (Category: Editor)
Editor actions to UpperCase, LowerCase, Capitalize or invert the
case of characters in a word or selection with a behavior similar to
Emacs' upcase-region-or-word, downcase-region-or-word and
To see how this could be useful, try installing it and pressing Alt-C
twice in a row (or in a middle of a word).
(If you've ever missed emacs' M-c, M-u or M-l then this plugin is
for you :) )
Feedback is very welcome.