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Open BIM Program is a marketing campaign initiated by GRAPHISOFT®, Tekla® and other members of buildingSMART® to urge and facilitate globally coordinated promotion of the Open BIM concept throughout the AEC industry, with aligned communication and common branding available to programme participants.
More Info:
http://www.graphisoft.com/OpenBIM/
Download ArchiCAD for free:
https://myarchicad.com/