Umano/AndroidSlideUpPanel - This library provides a simple way to add a draggable sliding up panel (popularized by Google Music and Google Maps) to your Android application.
Aritraroy/PinLockView - A clean, minimalistic, easy-to-use and highly customizable pin lock custom view for Android.
Square/retrofit - Type-safe HTTP client for Android and Java by Square, Inc.
ReactiveX/RxAndroid - Android specific bindings for RxJava 2.
Square/okhttp - An HTTP & HTTP/2 client for Android and Java applications. For more information see the website and the wiki.
Square/leakcanary - A memory leak detection library for Android and Java.
Bumptech/glide - Glide is a fast and efficient open source media management and image loading framework for Android.
Google/Gson - Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object.
Airbnb/lottie - Lottie is a mobile library for Android and iOS that parses Adobe After Effects animations exported as json with Bodymovin and renders them natively on mobile and on the web!
PhilJay.MPAndroidChart - A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.
Grandcentrix/tray - A SharedPreferences replacement for Android with multiprocess support.
Mockito 2 - Most popular mocking framework for Java.
Powermock/powermock - PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.