Funding agencies websites are a wealth of information. Search for an agency's strategic priorities to discover current hot topics in funding.
Many funding agencies now require a Research Data Management plan be submitted with grant applications. Each agencies has different guidelines so be sure to review them carefully.
In general, successful grant applications are not made publicly available, but some funding agencies do provide examples of successful grant proposals. Although they may not be formally made publicly available, it is possible to find some via Google using phrases like sample grant proposal and successful grant application example.
