Open Source Software = Free Software Libre Software Free/Open Source Software (FOSS or F/OSS) Free/Libre/Open Source Software (FLOSS)
Non-Commercial Software Freeware Shareware != Open Source Software
Open Architecture Open System Open Interface/Standard/Format != Open Source Software
Remember to think of “free” as in “free speech,” not as in “free beer.” Richard M. Stallman (1996)
Open Source Software = Increased Agility/Flexibility Faster Delivery Increased Innovation Information Assurance & Security Lower Cost
Open Source Software = "software for which the human-readable source code is available for use, study, re-use, modification, enhancement, and re-distribution by the users of that software"* *Reference: 16 October 2009 memorandum from the DoD CIO, "Clarifying Guidance Regarding Open Source Software (OSS)"
Open Source Software = Commercial Off-The-Shelf (COTS)
Open Source Software = Commercial Off-The-Shelf (COTS) Mil-OSS WG3 · 30August 2011 · Atlanta, GA www.mil-oss.org