The McCook-Sion White Dwarf Catalog
Some leftover numerical links:
Numerical Recipes in C, Fortran, and Fortran 90.
NR explains things well, but lots of numerical analysts don't like it; the authors don't think that all the criticism is justified.
Lots of good code can be found at Netlib, including linear algebra packages like LAPACK.
For Fourier Transforms, we like FFTW, the Fastest Fourier Transform in the West.
A similar set of self-tuning libraries for linear algebra is available in the ATLAS library.
A wide range of free routines is available in the GNU Scientific Library.
Sophisticated random number generators can be found here, or you can download some high quality random bits from Random.org, or from HotBits (generated from radioactive decays).
There is lots of useful material at the MathWorld.