• On Hacking, Richard Stallman

It is hard to write a simple definition of something as varied as hacking, but I think what these activities have in common is playfulness, cleverness, and exploration. Thus, hacking means exploring the limits of what is possible, in a spirit of playful cleverness. Activities that display playful cleverness have “hack value”.

• Guerilla Open Access Manifesto, Aaron Swartz

• GNU Manifesto, Richard Stallman
• Philosophy of the GNU project