I use my phone calendar, which is gmail, for everything including keeping record of workouts, when certain jobs were last done, future jobs to be done etc. My phone is my alarm clock, works even if the power goes out. I post just about every event into my phone, my wife who is the tech person writes everything on a calendar on the fridge then asks why I don't know about something or why I didn't write something on it. she gets an invite to everything I put in my calendar but refuses to adapt to tech.
I use a dry erase board as my project board on the farm, sometimes a paper shopping list, often times a note on my phone though.