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, ...
Washington, D.C. based incubator for social entrepreneurs, Halcyon Incubator, has selected seven ventures to move into the newly renovated Halcyon House in September for its inaugural class of fellows.
Business Grant Application Process | Personal Government Grants