Geoengineering

• Ocean Iron Fertilization, the practice of adding iron or iron compounds to the ocean to stimulate phytoplankton growth

Formats

• Object Interchange Format, a database management protocol developed by the Object Data Management Group
  Object Data Management Group
  The Object Data Management Group was conceived in the summer of 1991 at a breakfast with object database vendors that was organized by Rick Cattell of Sun Microsystems...
  
  

Foundations

• Optimist International Foundation
  Optimist International
  Optimist International is an international service club organization with 3,200 clubs and almost 100,000 members in more than 35 nations throughout the world. The international headquarters is located in St...
  
  , a charitable foundation dedicated to instilling optimism in youth
• Osteogenesis Imperfecta Foundation, a charitable foundation in support of osteogenesis imperfecta
  Osteogenesis imperfecta
  Osteogenesis imperfecta is a genetic bone disorder. People with OI are born with defective connective tissue, or without the ability to make it, usually because of a deficiency of Type-I collagen...
  
  

Organizations and forums

• Organisation internationale de la Francophonie, or simply the Francophonie, an organization of French-speaking polities
• Optical Internetworking Forum
  Optical Internetworking Forum
  The Optical Internetworking Forum is a non-profit, member-driven organization founded in 1998. It promotes the development and deployment of interoperable networking solutions and services through the creation of Implementation Agreements for optical networking products, network processing...
  
  , a communications industry forum