Skitch lets you take notes and share ideas with friends. By using the S Pen you can draw shapes, arrows and create fun sketches. The highlighting tool gives you the ability to highlight important notes in PDF files. You can mark up photos and screenshots. Sktich is integrated with Evernote, so when you create a new Skitch note, all your notes will sync to your computer and devices. You can download Skitch from the Google Play Store here.