Hey on android? Didn't know simplemobiletools was sold. Should be fine if updates are disabled from play store and only f-droid versions are used.
But for alternatives :
For a gallery app, I find Aves to look pretty good and has many great features https://github.com/deckerst/aves
If you need gallery (still not that great yet) & backup : ente gallery (there are other ente apps too) https://ente.io/
For a calendar no idea.
I finished Laika : Aged through blood. An indie metroidvania / 2d bike shooter / bullet time.
And i can say that it is, damn amazing!
It's the story of a mother in a post-apocalyptic environment having to care for her daughter and village while doing the war outside.
Everything, art, music, is a masterpiece. The music is just extremely good.
Outside of special zones, there are 20 you have to find, and it cycles between them. All 20 are voice, with words or humming.
The story is good, and is extremely anti-war.
The gameplay feels amazing. It can be hard at first, but I quickly learned how to control the bike and and to do backflips and frontflips at the right time to reload guns and the pary.
The main character laika is one-shot, but the game isn't very punishing. The respawn points aren't too far away from each other, and they are optional. When you die, you loose a pouch with the currency, and can get it back.
There are some little issues with the game tho. It doesn't tell that combo rewards more currency from enemies (it's a timed combo, sho shooting will either increase or refresh the combo, and shooting flying bodies increases the combo up to 2 more times). The ending seems to also be a bit rushed. The ending boss isn't that difficult, and there were some cuts it seems.
But overall these little issues aren't that bad, and the game is still amazing.