Linux General
Linux.com
Linux at Wikipedia (comprehensive introduction and gateway)
The Linux Documentation Project
Linux Online
ReviewLinux.com
Linux Distributions
Debian
Fedora and Red Hat
openSUSE
Ubuntu
Linux at Rutgers
Linux for Engineeering and IT Applications (course offered each Spring by Department of Mechanical and Aerospace Engineering)
Linux Software for Mathematical Finance
Eclipse (Integrated Development Environment for C, C++, Java, ...)
Emacs (GNU text editor)
Gcc (GNU C/C++ compiler)
Gsl (GNU Scientific Library)
KDevelop (Integrated Development Environment for C/C++)
Kile (Integrated Development Environment for LaTeX)
Octave (Open source equivalent to MATLAB)
Python (Programming language for numerical computing)
QuantLib (Open source library for financial engineering)