The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics
Homepage of the Dr. Remeis Observatory in Bamberg
HEASOFT & ISIS installation
guide by Mike Nowak to install HEASOFT and ISIS
Applications of classical Physics
Lecture notes on everything except quantum mechnanics by Kip Thorne, one of the world's leading experts on the astrophysical implications of Einstein's general theory of relativity.
(shell: convert, identify)
ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert (translate, flip, mirror, rotate, scale, .... ) and write images in a variety of formats (over 100).
PhD Comics: a grad student comic strip