How Matters has published an important list of resources, that answer this question:
A few select quotes:
The web of local civil society organizations and grassroots initiatives around the world is still largely undocumented and unrecognized. WiserEarth.org has registered over 110,000 local organizations and movements working on a wide variety of issues in 243 countries. They estimate that there may well be over 1,000,000 such local groups operating across the globe.
I share the following list of resources to hopefully help in that constant struggle of resource mobilization.