Non Profits 

Helpful Grants Information for
Non Profit Organizations

USA.gov for Nonprofits (GSA)
Links to federal department and agency information and service for nonprofit organizations, including fundraising and outreach, grants, loans and other assistance, laws and regulations, management and operations, online services, registration and licensing, and tax information.

Congressional Research Service Reports:

How to Develop and Write a Grant Proposal (RL32159)
Resources for Grantseekers (RL34012)