Public.Resource.Org

Public.Resource.Org is a non-profit corporation whose motto is “Making Government Information More Accessible”.

From the organization’s articles of incorporation:

The specific purpose of this corporation is to create, architect, design, implement, operate and maintain public works projects on the Internet for Educational, Charitable, and Scientific Purposes to the benefit of the general public and the public interest; to increase and diffuse knowledge about the Internet in its broadest sense; to promote and facilitate the expansion, development, and growth of the public infrastructure of the Internet by any means consistent with the public interest through other activities, including, but not limited to, publications, meetings, conferences, training, educational seminars, and the issuance of grants and other financial support to educational institutions, foundations and other organizations exclusively for Educational, Charitable, and Scientific Purposes.

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ProPublica Nonprofit Explorer

From the site:

Nonprofit Explorer includes nonprofit tax return data released by the IRS in April 2013 for tax returns processed by the IRS during 2012. This generally consists of filings for the 2011 fiscal year, but may include older records. The IRS data release includes only a subset of what can be found in the full Form 990s. Wherever possible, we’ve linked to PDFs of the full 990 for each organization, some going back ten years, collected at public.resource.org.”

ProPublica also has an excellent guide for investigating nonprofits.