Barrett & Co.: Offices in Concord, Carlisle, and Lincoln, offers listings, new construction information, and open house mailing list signup.
Century 21 G.J. Brown Realtor, Inc.: Offices in Dracut and Tyngsboro; includes available properties list with school and town information.
Century 21 Nashoba: Includes current property listings with buyer/seller resources; offices in Pepperell and Groton.
Coleman & Sons GMAC Real Estate: Offers home listings, agent directory, and finance basics. Offices in Littleton and Waltham.
ERA Morrison Real Estate: Homes and commercial properties for sale in the Merrimack and Nashoba Valley area, with offices in Billerica, Chelmsford, Pepperell, and Westford.