Foldroid is a convenient tool to navigate through your mail folders, designed to be used with mutt (or another text based mail reader). It shows how many messages are in each folder and how many of them are new. This, combined with a tool like procmail to sort mails of mailing lists into separate folders makes selecting the right folder to run mutt with easy. Foldroid works best when you run it in a screen session, because then, it starts every instance of mutt in its own screen.
foldroid is implemented in C++ and licensed under the GNU LGPL.
foldroid uses a configuration file, ~/.foldroidrc, which you need to write before you can use it. The possible configuration commands are