My company has a match program and I want to donate money to a good opensource cause and/or Linux itself.
It seems like the linux foundation would be a good cause, but my company program does not have a profile for that 503c and I cannot find details on their website on how to donate.
Consider seeing if the particular pieces of software you use have their own donation system, then donate there. A donation to a smaller project could have a very large impact on its future.
The Linux Foundation is carried by billion-dollar companies and that's also the interests it serves, from what Icm hearing. I wouldn't worry about its survival.
The right name for "linux" is GNU/Linux. Initially Linux was just a kernel, with lots of free software from FSF. You can donate to FSF at https://www.fsf.org/about/ways-to-donate/
How much do FSF employees do these days? I was under the impression that most of the pronto FSF projects (GCC, gnome) are worked on mostly by outsiders (redhat and others)
One of the more important roles of the FSF is to provide the technical and legal infrastructure for the GNU project, and all programs that live under it.
They are not focused on directly employing programmers.
the linux foundation is not a 501(c)(3), it's a 501(c)(6). contributions to it are not deductible, so probably not eligible for your employer's matching program.