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Excellent reference for guitarists. Includes a very useful guide to chitarra chords as well as an excellent guide to chitarra scales. Not the flashiest tool, but lots of info that's very accessible.
Wide ranging collection of free classical chitarra tabs in plain text format. Compositions range from Baroque period (ca. 1600) up through the present.
Mutopia aims to be the Project Gutenberg for printed music. This is their small, but high-quality collection of classical chitarra sheet Musica available free for download. Fantastic resource.
Tablature (Tab) is a form of musical notation, which tells the player where to place their fingers on a particular instrument rather than which pitches to play. Here's a nice primer on how to use chitarra tabs.