Appalachian Audubon Society
- Includes action alerts, meeting and event schedule, newsletters, and photos and sound clips.
- http://www.ahartman.com/aas/

Greater Harrisburg Rose Society
- Encourages the cultivation of roses. Includes photographs, meeting schedule, list of officers, and membership information.
- http://www.ghrs.info/

Capital Area Greenbelt Association (CAGA)
- Includes trail ranger articles, information about events such as the bike tour and Earth Day, newsletters, and a membership form.
- http://www.caga.org/

Pennsylvania Landscape and Nursery Association (PLNA)
- Non-profit professional trade organization promoting the ornamental horticulture industry. Site includes membership benefits and application, directory of chapter, and a calendar of events.
- http://www.plna.com/

PennFuture
- Organization committed to conserving natural resources to develop prosperous a community. Site includes action alerts, environmental tips, donation and membership information, calendar of events, and legislative updates.
- http://www.pennfuture.org/