switching.software, a list of easy-to-use alternatives to well-known software

https://switching.software
Ethical, easy-to-use and privacy-conscious alternatives to well-known software
The source code for its website is published on codeberg (meaning you can suggest changes, etc.).

yuuire, a list of open source and privacy-friendly apps

https://guide.yuuire.com/recommendations/software/foss-alternatives
Website's source code on github

F-Droid recommended apps by divestos.org

https://divestos.org/pages/recommended_apps