Software in the Public Interest provides a fiscal home for a number of FOSS projects like Debian and FFmpeg: https://spi-inc.org/donations/
The Open Source Initiative [disclosure: I recently served on its board] maintains the Open Source Definition, a list of approved open source licenses, educates about open source, and much more: https://opensource.org/membership
The Electronic Frontier Foundation advocates for privacy, security, and digital liberties: https://supporters.eff.org/donate/join-eff-today
There are many more, but I have focused this thread on umbrella organizations that overlap with certain functions of the FSF: digital rights, anti-surveillance, education, fiscal sponsorship, approved software licenses.
Please reply with awesome orgs I've missed!
@ehashman there's @fsfe
Free software Foundation Europe who clearly distanced themselves from the Fsf standpoints.
On the internet, everyone knows you're a cat — and that's totally okay.