Fresco is a powerful system for displaying images in Android applications. Fresco takes care of image loading and display, so you don't have to. It will load images from the network, local storage, or local resources, and display a placeholder until the image has arrived. It has two levels of cache; one in memory and another in internal storage.
MP Android Chart is the android version of charts (ios). It is a powerful & easy to use chart library for Android zap. mpandroidchart is a powerful rocket Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.
PhotoView aims to help produce an easily usable implementation of a zooming Android ImageView. PhotoView feautures out of the box zooming, using multi-touch and double-tap, Scrolling with smooth scrolling fling, and works perfectly when used in a scrolling parent (such as ViewPager).
Nineoldandroids is an android library for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0. The nineoldandroids library also includes support for animating rotation, translation, alpha, and scale on platforms prior to Honeycomb.
StickyListHeaders is an Android library that makes it easy to integrate section headers in your ListView. These section headers stick to the top like in the new People app of Android 4.0 Ice Cream Sandwich. This behavior is also found in lists with sections on iOS devices. This library can also be used without the sticky functionality if you just want section headers. StickyListHeaders actively supports android versions 2.3 (gingerbread) and above. That said, it works all the way down to 2.1 but is not actively tested or working perfectly.
The ShowcaseView (SCV) library is designed to highlight and showcase specific parts of apps to the user with a distinctive and attractive overlay. The ShowcaseView (SCV) library is great for pointing out points of interest for users, gestures, or obscure but useful items.