- I personally really like NoteLedge - it's a note-taking app that's great for generating notes, working with PDFs (highlighting and annotations), creating to-do lists, sketching and drawing. With this app, it's easy to keep everything organized and synced across all your Android devices. One function I use quite often is adding notes to my Google calendar - this helps with time management and keepting track of everything from my to-do list. This app is also intuitive and kind of fun to use.Great for collecting recipes and bookmarks of your favorite food blogs/web-sites. I also add handwritten notes as well and this is my top app on my phone.