Astronomy routines for MATLAB (and Octave?)
Over the last few years I've become a big fan of Matlab and its free, open-source, twin Octave so I was pleased to discover at least some professional Astronomers use it. The Astronomy & Astrophysics package for Matlab (Ofek 2014, see also http://ascl.net/1407.005) contains just under a thousand Matlab functions, including catalog access and ds9-interaction.
Hat tip: The Astrophysics Source Code Library.