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Ruler for Windows - It's a screen ruler for Windows.
deborphan - deborphan finds packages installed on your Debian/GNU system that have no other packages depending...
ScreenRuler - ScreenRuler lets you measure objects on your Ubuntu desktop using six different metrics.
GtkOrphan - GtkOrphan (a Perl/Gtk2 application for debian systems) is a graphical tool which analyzes the...
On-Screen Ruler - lightweight, free, semi-transparent ruler
aptitude - Terminal-based apt frontend.