"Use this database to view summaries of 2.2 million tax returns from tax-exempt organizations and see financial details such as their executive compensation and revenue and expenses. You can browse raw IRS data released since 2013 and access over 9.4 million tax filing documents going back as far as 2001." From Pro Publica.
"Transactional Records Access Clearinghouse (TRAC) is a data gathering, data research, and data distribution organization associated with Syracuse University. Transactional refers to data about individual activities. Data collected from the federal government, mostly under the Freedom of Information Act (FOIA) is made available to the American people via our massive data warehouse."
UW users may set up "Web Lockers" to save results.