NotaBene is a quick and easy way to take notes and send them to whoever you want from your iOS device.
Rocket Note allows you to take notes and pin moments for your favorite videos on YouTube.
Private Notes for Twitter and Facebook lets you add notes to your chosen profiles on these two social networking sites.
If you want to save Apple notes in a plain text format, Exporter will help you do that.
When writing a story, you will first need to create the characters. Character Notes will help you create characters on your Android.
Have a thought that needs to be noted down? Papier will help you note down your thoughts each time you open a new tab.
Got something to say about a YouTube video? vdNote will help you take and share notes for your favorite YouTube videos.