Free Software menurut Free Software Foundation (http://www.fsf.org):

“Free software is software that gives you the user the freedom to share, study and modify it. We call this free software because the user is free.”

Open Source seperti yang dilansir Open source Initiative (http://opensource.org) :

“Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.”