The Texas Grants Resource Center, part of the University of Texas at Austin, is an important resource for help in accessing funding information:
We expect foundations to have money but not necessarily to advertise its availability. Those who seek foundation funding look for a suitable match; that is, foundations with matching interests and sufficient funds. For this information:
Candid is an organization combining two familiar names in the business of providing foundation information, Foundation Center and Guidestar. On the Candid page, see "Candid at a Glance" (at the top right) for a list of available databases and products.
The Foundation Center has been doing this for a long time. Staff collect information about foundations (including those without websites) and create a searchable database of foundation information. The Center also offers a basic version of their searchable database. The Texas Grants Resource Center arranges for access: Foundation Directory Online - Essential. For a comparison of the basic and preminum versions, along with pricing, see the information page.
Guidestar claims to be "the world's largest source of information on nonprofit organizations," including foundations. There's a basic search option and a "premium" option.
NOZA provides "the world’s largest searchable database of charitable donations," including foundation grants. Some information is offered for free, though payment is required for advanced options.
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