1. Public hosting cooperatives
[http://www.crosswired.org.uk/ Crosswired]
[http://www.epfarms.org/ Eggplant Farms]
[http://www.fiasco.org.il/ Fiasco]
[http://www.gaiahost.coop/ GAIA Host Collective]
[http://www.mindfridge.org/ Mindfridge] - looks dead. Last time it was up they only had "3 out of 8" people they needed to get off the ground.
[http://www.hosting-coop.org/ The Web Hosting Cooperative]
[http://www.trash.net/ trash.net] (German only)
[http://electricembers.net/ Electric Embers]
[http://www.spaceship.com/ Spaceship.com]
2. Groups primarily offering internet access
[http://www.rain.org/ RAIN] - old internet "charity" which offers internet access, basic hosting, and a variety of services
[http://greenbelt.com/giac/ Greenbelt Internet Access Cooperative] - Also offers basic hosting services.
[http://www.pwrtc.com/ Pulaski-White Rural Telephone Cooperative] - Primarily telephone, but also offers internet access with basic hosting services.
3. Private hosting cooperatives
[http://www.beigetower.org/ Beige Tower] ([http://www.beigetower.org/forums forums])
[http://hosting-cooperative.com/ hosting-cooperative.com]
[http://www.hatters.org.uk/ Mad Hatters' Web Server Club]
[http://mongers.org/ mongers.org]
[http://www.projectcolo.org.uk/ Project Colo]
4. Public access UNIX systems
[http://www.grex.org/ GREX] - one of the oldest free shells out there
[http://sdf.lonestar.org/ SDF]
[http://www.silenceisdefeat.org/ Silence is Defeat]
[https://www.hbx.us/ HBX Networks]
5. Hosting providers with somewhat non-traditional feels
6. Community Colocation
[http://www.communitycolo.net/ California Community Colocation Project]
[http://www.chiccp.net/ Chicago Community Colocation Project]
[http://tccp.ca/ Toronto Community Colocation Project]
[http://lists.gotroot.com/mailman/listinfo/dcccp DC Community Colocation Project] (forming)