I’m always keeping a look out for ways to go more open source with my software/site needs. Here’s a few links to github pages where people have collated a number of things to make life a little less corporate.
https://github.com/awesome-selfhosted/awesome-selfhosted
https://github.com/mendel5/alternative-front-ends
I’ll definitely be adding more as I find them. If you can, self-host the software you need in your life. If not, at least give the corporations as little as possible in the way of your personal and private data.