For private grants, you may want to check the Foundation Center's Foundation Grants for Individuals Online. It's a subscription based website ($9.95 per month) but their opening blurb only says that the database is ideal for "students, ...
Ryan Devlin, Todd Grinnell and Ravi Patel have traveled to Africa on a humanitarian trip a few years back, encountering children suffering from severe malnutrition get healthy through Plumpy’Nut®.
Business Grant Application Process | Personal Government Grants