helm-tracker provides a helm interface for gnome tracker. Requires gnome
tracker to be installed.
put helm-tracker.el where emacs can find it (require 'helm-tracker) and
bind helm-tracker to a key, e.g. (global-set-key (kbd "C-t") 'helm-tracker).
tracker has to be installed and configured, see here.
The helm buffer simply shows the output of the command tracker search $command.
Where $command is the search term entered in the helm buffer, for details see
here.