University of Kansas: Community Toolbox
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Community Tool Box
https://ctb.ku.edu/en
Tools to change our world – free resources for those working to build healthier communities and bring about social change.
The Community Toolbox is a resource provided by the Center for Community Health and Development at the University of Kansas, and I've referenced them from time to time in my college organizing work. It has a strong focus on non-profits, but there's still a lot of stuff that I think is really pertinent to community organizing in general.