Simple Mobile apps have been very popular among FOSS enthusiasts. I've personally been using the Gallery, Contacts and the Phone app since a few years now. It's a shame that it has come to this, will be on the lookout for their forks.
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I think it is worth mentioning that there is an alternative for each one of Simple Mobile Tools apps. It will just mean we have to spend some time looking for such apps yet again. We as users of FOSS software must be always prepared to move from one application to another. This is why walled gardens, export to / import from open standard formats and in general easy replaceability of FOSS SW is important. This is just a sad fact about using FOSS where FOSS maintainers are just normal people, with all their needs, faults, and weaknesses.
Simple Gallery has a feature rich photo and video editor as well. I haven't found any FOSS app that can edit videos. Also, any Material You themed Dialer app? Don't want to use the old AOSP one :(
Other than these two, I think all other apps have good alternatives.
That is example that looking for new apps part I mentioned. I know there are FOSS Android video and proto editors. I just never needed any of them, so I don't know which one is better or worse, but I know there are a few I have heard about in recent years. I know I have seen several contacts and dialler apps on F-Droid. Time to check them out one by one and hopefully one will fit the needs with minimal concessions. Others in this post have already mentioned some apps. See if they might work for you, too. I wish you best of luck looking for the right apps for you.