- Alternatives for Community and Environment
- American Public Transportation Association
- BikeRide.com
- Bike Friday
- Boston Cyclists Union (Facebook)
- Boston Society of Civil Engineers (Calendar)
- CAFEH: Community Assessment of Freeway Exposure and Health Study
- Charlestown Chamber of Commerce
- http://chrisleinberger.com/
- Consensus Building Institute
- Conservation Law Foundation
- Davis Square Task Force
- East Cambridge Planning Team
- ecitizenfoundation.org
- e-democracy.org
- Friends of the Community Path (Somerville)
- Friends of the Community Paths (regional)
- Gentle Giant Rowing Club
- Groundwork Somerville | interactivesomerville.org
- Interactive Somerville Open Neighborhood
- Livable Streets Alliance
- Magoun Square Neighborhood Association Blog
- MassBike.org
- Medford Green Line Neighborhood Alliance (Yahoo Group)
- MetroFuture.org (Events)
- MoveMass.org (Events)
- Mystic Crossing
- Mystic River Watershed Association (Calendar)
- Mystic View Task Force
- Open Data for MA Transportation
- http://www.smartgrowthamerica.org/
- SomervilleBikes.org (Events)
- Somerville Climate Action
- Somerville Community Corporation
- Somerville Parking Advocacy and Reform Coalition
- Somerville Transportation Equity Partnership (STEP)
- http://www.unionsquarefutures.org/
- WalkBoston.org (Calendar)