Syncthing. Works really good for paying nothing.

KDE with GNOME design or GNOME with KDE functionality.

Consistency between all elements, apps and other things.

Bruhh GIMP is so hard to use but it’s doing basic stuff I needed like typing text.

If I needed Photoshop or something else I would use GNOME Boxes.

The most secure app I know is SimpleX. It is like Matrix but without an identifier, so you really interacting only with people you want. No one can reach you unless you gave him a link to connect to you.

Two different people cannot be ensured they are talking to the same person since there is no identifier they can compare to.