For personal use I'm happy with ProtonMail and F-Droid. For a calendar I use paper because I like being able to look at the wall and see the month, and to physi

For personal use I'm happy with ProtonMail and F-Droid. For a calendar I use paper because I like being able to look at the wall and see the month, and to physically write things down. Same goes for note-taking, though that's a hybrid of digital and paper, with a goal of the important-er stuff going into the text files for easier searching (though like with paper books I have a sense where in each notebook certain things are). Good luck!