This app allows you to organize and manage your files and content such as pictures, music, or documents.

Skitch is a free app that helps you communicate visually with friends and co-workers. Annotate images with arrows, shapes, text, and more.

Genius Scan turns your phone into a pocket scanner.

SoundNote records the audio of a lecture or meeting while you take notes.

Easily organize your thoughts into a mind map and customize it with SimpleMind+. You can share your mind map via the Internet, email, and your camera roll.

Popplet allows you to create, organize, and sort all of your ideas.

Notability is a note-taking app that allows you to type, insert a figure, and insert a web clip or a picture. It also allows you to record a teacher’s lecture.

Evernote allows you to easily create text, photo, and audio notes, which can be synchronized to any computer to help you remember important things.

With Dropbox, you can take files from your computer or phone wherever you go. You can even share your Dropbox with others, and vice versa.