privacyguides.org has been a great resource for years now. They also have a community at !privacyguides@lemmy.one
There are many resources across depending on what you are looking for: https://switching.software https://madaidans-insecurities.github.io https://www.btw.so/open-source-alternatives https://gitea.it/devol/Awesome-Privacy-servizi-web-open-source https://github.com/lissy93/awesome-privacy
Please note that these list may not be completely up-to-date, but you find and a lot of useful tools there imho.
Some useful links also:
This is in addition to the great Privacy Guides link another commenter mentioned.
+1 for alternativeto. Searching for alternatives to popular apps using the filters like "Open Source" as well as operating system, privacy, etc.. is a game changer. There's also comment sections where people sometimes elaborate on certain things like differences between the app you're comparing to.
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