Build a list of companies that match your criteria or research known companies. There is much overlap in these sources, but each has particular strengths.
Lots of keywords and cross-disciplinary verticals to explore niche industries. Focuses primarily on PE or VC investors and the companies they invest in.
A database of millions of US nonprofit organizations. Search for organizations and people by name, geography, financials, or a variety of other criteria. Reports include general information on the nonprofit, people, mission and programs, goals and results, Form 990 filings, and financial data.
Search for Federal organizations by location and subject area. Find contact information for alumni or other individuals by their position or organization.