FOSS Material Design Essentials
These are what I consider essential apps in achieving a near 100% FOSS and MD3 setup. There are some apps types (calendar, email, etc) that are missing from the list because I couldn't find an app that meets the FOSS and MD3 criteria. This list specifically is a little unorganized because Throne mirrors the position of these apps from my other lists, and one edit changes all. Not all of these apps have been reviewed. This is not supposed to be a master-list of ALL FOSS Android apps. None of these apps are sponsored or have referral links.
Thanks to nyas1 for their master-list in making this project more complete: https://github.com/nyas1/Material-You-app-list