zarlin

Boombrush is a great choice

No full guarantee, but scanning all downloaded files using a tool such as malwarebytes can help catch a lot of malware.

And ofc the most important one: Common Sense! If something seems too good to be true, it probably is.

TerraBrush is quite nice. Not as complex as other terrain editors, but good and easy to use for basic terrains.

Obsidian + Syncthing has been working prefectly for several years now for me, across Windows, Android and Linux.

The systemd website itself seems quite information-rich: https://systemd.io/

Already pre-ordered a while ago! I'm also curious about SailfishOS, and in general I want to support the Linux phone effort.

If you're willing to pay, Nebula is a streaming service setup by creators, without any ads or data harvesting/selling. The revenue goes directly to the creators. Their offer is still small, but quite a few creators I followed on Youtube I now follow there.

This is the currently maintained android version: https://github.com/researchxxl/syncthing-android

Since she likes puzzles, the Trine game series could be nice! I think they added coop multiplayer starting with Trine 2.

If you both like hack 'n slash then Torchlight 2 is also great fun!

https://vikunja.io/ work very well, and can be used as a PWA

Take a look at Bunny ( https://bunny.net/dns/ ), they're based in Europe with worldwide coverage, and have a lot of other useful services as well.