R

• R Project
• Exploration of R
• Calling C and Fortran from R
• A link to Rmath

GNU

• GNU Project
• GNU C Library
• GSL- GNU Scientific Library 
• GSL - Reference Manual
  

Linux

• Linux Online!
• Linux Beginner Lessons
• Linux Tutorial from UC Davis
• Unix Tutorial for Beginners from Surrey U.K.

IEEE Standard for Floating-point

• IEEE 754 Standard from Intel
• Decimal to Floating-point Converter
• Comparing  Floating-point Numbers

Random Number Generators

• GSL Reference Manual: Random Number Generation
• pLab Random Number Generator Page
• Mersenne Twister Home Page
• Marsaglia's DIEHARD battery of tests

Sources for Software  

• Netlib
• Statlib Index
• GAMS
• BLAS Homepage
• LAPACK Manual
• LAPACK Naming Scheme
• A Dictionary of  LAPACK routines on Linux
• GUI for LAPACK routines