Here are some helpful resources.
Find Funding Organizations
While some of your non-profits will already have Grantmakers in mind, others may ask you to research foundations and other types of grantmakers. Knowing how to conduct this kind of research is a very valuable skill that will make you more versatile as a grantwriter. Many databases of funders have expensive membership fees because they sell subscriptions to non-profits and libraries. The resources that follow are free.