a person on a mission related to "Open" applications and operating systems. Someone who passionately supports Open source as a development methodology. Someone who support the development of source code for software that is made available for public collaboration, and it is usually released as open-source software.
Microsoft moved to appease its critics and reassure regulators by proclaiming that Office 2007 SP2 will support rival file format OpenDocument Format (ODF) 1.1 used by openistas such as IBM and Sun Microsystems.
by Michael Jahn October 23, 2008