BOSTON--(BUSINESS WIRE)--Berkshire Partners LLC, a Boston-based investment firm, has completed its acquisition of Accela, Inc. Accela is a leading provider of civic engagement software solutions for state, county and municipal governments. Abry Partners, an existing shareholder, will remain an investor in the company. Terms of the transaction were not disclosed. “Accela’s platform can transform how local and state governments interact with businesses and other constituents,” said Tom Kuo, a Man.