Links

The Common Lisp wiki contains a great deal of resources to learn and practice the language.
It is well maintained and has a recommendation of libraries to use in your projects.

A scientific software package developed at CERN which has a rich feature set.
It includes a C++ interpreter which can run lines of code you type in the terminal.

A general purpose mathematical package in the public domain, written in Fortran.
Despite its old age and outdated coding standard, these routines work well and are still used by current software.
The code is not very readable but it is well specified, and it is fun to browse and play with.

An operating system written by Terry A. Davis, God's favorite programmer.
Terry wrote the OS by himself from scratch along with its own compiler.

A large collection of cool animated pictures for modern websites.