Cambridge Local first
- A group of locally owned businesses promoting the "Shop Local First" campaign. Includes events, newsletter signup, and links to member businesses.
- http://www.cambridgelocalfirst.org/

Central Square Business Association
- An organization of business owners in Central Square devoted to the improvement of the business environment in the square. Site includes organizational information and a listing of members.
- http://www.centralsquarecambridge.com/index.asp

Center for Quality of Management
- Non-profit group offering courses in planning, operations, and change management. Also networking events and research and advising services.
- http://www.cqm.org/