Hellobee Boards

Feeling like a bit of a Luddite, but I'd say Stitcher for me.

Todoist
A lot of the same things as @Hypatia: lists, lists, and more lists.
My husband and I have ours synced so I can add items and they will show up on his list. It's the best way to keep running lists of household tasks, shopping lists, packing lists, etc. It even syncs with Alexa so we can tell Alexa "Add _____ to the shopping list."
Some cool things we have used it for: a list of questions to ask the pediatrician at our next well-check, a list of restaurants that our kids like to eat at, an always up-to-date list of our kids current sizes in clothing, shoes, different brands, etc.

I love Paprika for grocery lists, meal planning, and storing recipes. It costs money, but it's a very low amount, like a few dollars. Worth it!