Southern Illinois Linux Users Group
- Special interest group that meets in Carbondale (Southern Illinois University) and O'Fallon to discuss the Linux operating system. Meeting times, lists, and resources are provided.
- http://www.silug.org/

Southernmost Illinois History
- Features memorable moments of history for Alexander, Union, Pulaski, Johnson, Massac counties along the crescent of the Ohio River.
- http://southernmostillinoishistory.net/

Rotary District 6510
- Regional district for this public service organization. Includes district goals, news, member clubs directory, meeting day calendars, accountability reports, and its special project on its Belize Crippled Children's Program.
- http://www.rotary6510.org/

Southern Illinois Community Foundation
- Serves the region through its philanthropy. Includes overview of projects and funds, links, and contacts.
- http://www.sicf.org/

Diocese of Belleville
- Representing the Catholic Church in Southern Illinois. Features news and events, map of parishes and schools, clergy and religious life information, newsletters, resources, and links.
- http://www.diobelle.org/