Linux Sources

http://ragib.hypermart.net/linux/
MINIX Source Code
http://www2.educ.umu.se/~bjorn/linux/misc/linux-history.html
www.linuxhq.com
www.mandrakesoft.com
www.distrowatch.com

Windows Sources

www.microsoft.com
http://inventors.about.com/library/weekly/aa080499b.htm
http://www.microsoft.com/windows/WinHistory/Desktop.mspx

Software Sources

http://gaim.sourceforge.net
www.mozilla.org
www.wmware.com
www.gimp.org
www.openoffice.org