Useful Links:

PROJECT GUTENBERG This is The Great Library of e-books

archive.org This is another Great Library of e-books in pdf format

Cygwin shell This is GNU shell for Windows

VirtualDub Video viewer/convertor/processor

Irfan View Graphic Viewer Most popular image viewer

Notepad++ Very popular text editor

ConTEXT editor Great editor for programmers

PSPad editor Another great editor for programmers

Hex Editor XVI32 Good hex editor running under Windows