Let's Encrypt
letsencrypt.org
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Internet Security Research Group is a California public benefit corporation whose application for recognition of tax-exempt status under Section 501(c)(3) of the Internal Revenue Code is currently pending with the IRS. ISRG’s mission is to reduce financial, technological, and education barriers to secure communication over the Internet.