Booh uses

- the ruby programming language

- XML documents to save config files

- convert/identify from ImageMagick for thumbnails,
  mplayer for videos manipulation

- ruby-gettext for i18n

- ruby-gtk2 for the GUI

  - with a self widget, `GtkAutoTable', allowing to view the
    thumbnails and edit captions while dynamically reordering
    when main window resize

  - with many keyboard shortcuts