INbox is n unconventional email interface that takes a bit of getting used to, BUT, if you're trying to keep only the important shit in your face, you SNOOZE an email
that you don't need to act on today. Reminders are built into it also, so perfect to type little notes right there in your email which is likely open all day anyways.
if you're a To-Do list fan, and LOVE the post-it notes, Google Keep is perfect. It's got multiple colours of notes, and they can be shared with other users.
Since I started helping LKprefabs with the stuff she doesn't have time to handle with Kuro, I've been bugging her with these notes and she actually uses them!