OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

GitJournal - Manage your Notes from any Git Repo.

Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.

Calendar Note by Enex - Calendar Note app allows users to view the calendar so they can write notes and memos according to dates to get alerts about tasks.

Category Tabs for Google Keep - Better organize your Google Keep Notes

Daybreak - An intelligent to-do app that learns when to remind you