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If you're looking for an awesome collection of widgets to add to your tablet or smartphone home screen, look no further than the feature-rich Beautiful Widgets app. It lets you personalize all the widgets, so you can configure them to look and behave exactly how you like them.
If you have a rooted device, you owe it to yourself to look into ROM Manager. With the help of a great UI, it lets you easily apply nightly builds. It also makes switching ROMs a snap and you can even back up your ROMs.
If your Android device also serves as your music playback device, you owe it to yourself to install Poweramp. For me, this app is worth it just for the 10-band graphic EQ. For others, the vast number of supported formats will make this a must-have music app. You will also find plenty of other features, such as outstanding OpenGL-based cover art animation and gapless playback.