Federal Agency Form Sets
NIH Forms & Applications (See Standard Form 424) - "There is no universal form set available for download. The form set is tailored to each type of grant program and each funding opportunity announcement guides you to the systems through which you can complete the forms (e.g., ASSIST, Workspace, System-to-System Solution)." (NIH Website)
Research.gov - Research.gov is the National Science Foundation's (NSF) grants management system that provides easy access to research-related information and grants management services in one location. See Form Kits Table of Contents as well as the Grants Proposal Guide.