HoverChat lets you message without stopping what you're doing.
HoverChat is a messaging app that lets you continue your conversations even while you're using another app or watching a movie. By resizing and deciding how transparent you want the messaging window to be, you can customize your messaging to fit what you're up to.
Google Keep is a powerful tool for recording what's on your mind.
Google Keep is a flexible note-taking and reminders app. You can color-code your notes and take pictures from within the app, and if you record a voice memos on the go, the app will automatically transcribe it for you.