Richard Stallman
Home Page

Founder of GNU operating system

Founder of the Free Software Foundation

http://www.gnu.org/home.html

Linus Torvalds
Home Page

Founder of the original Linux operating system

http://www.linux.org/

Larry Wall
Home Page

Creator of Perl programming language

http://www.perl.org/

Eric Raymond
Home Page

President and co-founder of the Open Source Initiative

http://www.opensource.org/