Useful Documentation
Libraries and Packages:
GIMP Manual
GTK+ Tutorial
Introduction to Latex
(gzipped postscript).
Programming Languages:
Java[TM] Tutorial
Java[TM] API Specification
Python Tutorial
Common Lisp
, by Guy Steele.
Linux:
LDP:
the Linux Documentation Project.
The Linux Kernel
, by David Rusling
The Linux Programmer's Bounce Point
Linux Kernel Hackers' Guide
Linux Programmers' Guide