“Road to Mac Office 2008: PowerPoint '08 vs Keynote 4.0” (英語). AppleInsider (2007年11月16日). 2024年4月2日閲覧。 “In 2000, Microsoft paid $1.3 billion to acquire Visio Corporation, which had delivered a clone of the Lighthouse Design Diagram! application for NeXTSTEP. The Omni Group delivered a similar product for the Mac called OmniGraffle (below), which Apple bundles on new Macs.”
