What is constellation dealership software group? Constellation Dealership Software group is a wholly-owned subsidiary of Constellation Software Inc. (TSX:CSU), a leading provider of software and services to a select group of public and private sector markets.How do i contact constellation software? Constellation Software, Inc. : Constellation Software, Inc. > About Us. Address. Constellation Software Inc. #1200 - 20 Adelaide Street East Toronto, ON M5C 2T6 CANADA. Tel: (416) 861-2279. Fax: (416) 861-2277. © Copyright Constellation Software Inc. All Rights Reserved.What is constconstellation software? Constellation Software is a leading provider of software and services to a select group of public and private sector markets.Why work at constellation? With over 100 employees dedicated to development and customer services, Constellation is ableto lead the industry in service and support. A high priority at Constellation is to hire well-trained, knowledgeable, courteous, and professional staffto help make our software reliable and easy-to-use.