This collection should be seen as sample proposals and not necessarily model proposals. In reviewing them, keep in mind that some are dated and do not necessarily reflect current funding priorities and proposal requirements of these same grantmaking agencies. Nevertheless, sample proposals are a source of ideas; sometimes they point out things you may want to emulate in your proposals, and other times they illustrate qualities you wish to avoid. Either way, you learn something.
A Collection of Successful Proposals: NSF, NIH, DOE, ACS (Supplement to Thomas Blackburn’s Getting Science Grants)
National Science Foundation
National Institutes of Health
National Endowment for the Humanities
National Endowment for the Arts
Education: K-12 School Grants (US Dept of Ed and other agencies)