• Cosmology: A Research Briefing (PDF) - Excellent summary from the National Research Council
• Ned Wright's Cosmology Tutorial
• Microwave Anisotropy Probe Home Page
• NCSA Cosmos in a Computer
• Mysteries of Deep Space Timeline - from PBS
• Dark Matter tutorial by Jonathan Dursi, includes java® cluster simulation
• The Physics of CMB Anisotropies - well-illustrated intro by Wayne Hu
• The Cosmological Constant - review article by Carroll, Press, & Turner
• N-body animations - nice movies from John Dubinski (warning: very large files)

General Astrophysics and Physics

• Astronomy Picture of the Day
• Hubble Space Telescope Science Institute
• Chandra X-Ray Observatory Center
• Sloan Digital Sky Survey
• Nobel Prizes in Physics

Online Publications

• astro-ph - LANL preprint server
• ADS - The best way to find astrophysics publications
• SPIRES
• Astrophysical Journal

General Relativity

• Sean Carroll's General Relativity notes and links - Excellent resource

Software and Numerical Methods

• Astrophysics Source Code Library Archive - Archive of many useful astrophysics codes
• CMBFAST- Fastest way to compute CMB anisotropy spectra
• COSMICS - high-accuracy initial conditions for cosmological simulations
• Big Bang Java® Nucleosynthesis Calculator- Fun from Mendoza and Hogan at Seattl
• Numerical Recipes
• Romberg integration subroutine: C (PDF) or f77 (PDF)
• Netlib mathematical software repository
• National HPCC Software Exchange

Preparing and Displaying Electronic Documents

• LaTeX help
• The Bare Bones Guide to HTML
• Writing HTML - includes an introduction to Java®
• Sun Java® Tutorial
• Another HTML tutor - with CGI scripting/programming
• Ghostscript and Ghostview - Postscript® previewer
• Acrobat Reader - software for displaying and printing pdf files