Cartes du Ciel, or Skychart, is among my favorite tools for observing. The interface is as full-featured and customizable as commercial offerings, it doesn't require massive space on the hard drive, nor does it eat up the computer's resources when running. I use it primarily for creating observing lists and printing charts, but it also includes a telescope driver for the computerized set. And it's free.
Cartes du Ciel
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