The Online Writing Lab at Purdue (OWL Purdue) - Writing help
MLA Formatting and Style Guide (OWL Purdue) - Citation guide
APA Formatting and Style Guide(OWL Purdue) - Citation guide
USA.gov - Information on all government agencies, federal, state, and local officials, laws, and policies
MKL Subject Guides - Specialty databases on every subject
Chicago Manual of Style - Tips on how to format your papers, grammar and punctuation rules, etc.