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The Free Software Foundation (FSF) is a 501(c)(3) nonprofit organization based in Boston, MA, USA.
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If you don't do it already, please investigate matching gift opportunities at your employer. The FSF is normally eligible, and it's a great way to double your donation. If needed for the transaction, our tax ID is 042-888-848.
This version of CiviCRM contains modifications made by the Free Software Foundation, Inc. Complete source code