Menstruators the world over will rejoice over Clue, a simple app with a beautiful design for tracking your period and predicting when the next will occur. Using the data you enter about your cycle—and other factors—you can use Clue to plan ahead, whether it's for pregnancy or just to keep ahead of your cycle. Reminders and a handy calendar tool can help take the guesswork out of life. Best of all, it's totally gender neutral, and not the expected pink. Droid Apps
The library is an often-overlooked public resource (and some are modernizing quickly), but OverDrive brings it back into the fold with the newly redesigned, Libby. Supported by over 30,000 libraries worldwide, the app lets you access your local library's array of available ebooks and audiobooks. Use it to download titles, place holds on titles not yet available, and consume your borrowed content. The only requirement is a library card (or its digital equivalent). Android App
Songkick is the bridge between the music in your digital collection and concerts in your area. Once installed, Songkick scans your device for tunes and then lets you see when and where your favorite artists are playing. If you see a show you're interested in, you can also purchase tickets all from within the app. Add multiple locations to Songkick to catch concerts when you're on the road. Droid Apps
GetJar’s clever draw is to offer premium apps to users for free to generate traffic, and then monetize that traffic with advertising dollars. App developers considering GetJar might be tempted by the virtual currency tie-ins, and the option to target new users with different kinds of promotions. Be warned, though, the submission process might take a while.