Wikipedia
OPNET
OPNET Technologies, Inc. was a software business that provided performance management for computer networks and applications.
The company was founded in 1986 and went public in 2000. In October 2012, OPNET was acquired by Riverbed Technology, for about $1 billion US dollars.
Prior to Riverbed, OPNET was headquartered in Bethesda, Maryland and had U.S. offices in Cary, North Carolina; Nashua, New Hampshire; Dallas, Texas; and Santa Clara, California. It had international offices in Slough, United Kingdom; Paris, France; Ghent, Belgium; Frankfurt, Germany; and Singapore, with staff and consultants in multiple locations in Asia and Latin America.