The Open Software Foundation, Inc. (OSF), was a not-for-profit industry consortium for creating an open standard for an implementation of the operating system Unix. It was formed in 1988[1] and merged with X/Open in 1996, to become The Open Group.[2]
Despite the similarities in name, OSF was unrelated to the Free Software Foundation (FSF, also based in Cambridge, Massachusetts), or the Open Source Initiative (OSI).