- Google Gson (Utility)   A Java serialization/deserialization library to convert Java Objects into JSON and back. 
- Android Support v4 (Development Framework)   The Android Support Library is not actually a single library, but rather a collection of libraries that can roughly be divided into two groups: compatibility and component libraries. For details, please see  Understanding the Android Support Library. 
- AndroidX Activity (Utility)   provides the base Activity subclass and the relevant hooks to build a composable structure on top. 
- Android Jetpack Annotations (Utility)   library that contains the annotations for Android Jetpack. 
- Arch (Utility)   helper for other arch dependencies, including JUnit test rules that can be used with LiveData. 
- AppCompat (Utility)   support newer Android features on older Android versions. 
- Cardview (UI Component)   AndroidX library to implement the Material Design card pattern with round corners and drop shadows. 
- Android Support Library collections (Utility)   standalone efficient collections. 
- Constraint Layout Library (Utility)   library to reduce the number of nested views needed. 
- Coordinatorlayout (UI Component)   AndroidX library to position top-level application widgets, such as AppBarLayout and FloatingActionButton. 
- Androidx Core (Utility)   a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. 
- AndroidX Cursor Adapter (Utility)   static library support version of the framework's CursorAdapter. 
- Android Support Library Custom View (UI Component)   a module to implement custom views. Part of the Android Support Library. 
- Documentfile (UI Component)   a library to view a file document. 
- Drawerlayout (UI Component)   AndroidX library to implement a Material Design drawer widget. 
- Dynamicanimation (UI Component)   create smooth animations with a physics-based animation API. 
- AndroidX Fragment (UI Component)   AndroidX library to encapsulate part of the user interface or behavior into reusable components. 
- Interpolator (UI Component)   AndroidX library to use animation interpolators on older platforms. 
- androidx.legacy (Utility)   a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. 
- Lifecycle (Utility)   perform actions in response to a change in the lifecycle status of another component, such as activities and fragments. 
- Loader (Utility)   library to load data for your UI that survives configuration changes. 
- AndroidX Local Broadcast Manager (Utility)   an application-wide event bus and embraces layer violations in your app: any component may listen events from any other. 
- Navigation (Utility)   a framework for navigating between 'destinations' within an Android application that provides a consistent API whether destinations are implemented as Fragments, Activities, or other components. 
- Preference (Utility)   a library to build interactive settings screens without needing to interact with device storage or manage the UI. 
- Print (Utility)   a library to print photos, docs, and other graphics and images. 
- Recyclerview (Utility)   display large sets of data in your UI while minimizing memory usage. 
- Android Activity Saved State (Utility)   provides the base Activity subclass and the relevant hooks to build a composable structure on top. 
- Tracing (Utility)   AndroidX library to write trace events to the system trace buffer. 
- Transition (UI Component)   animates motion in the UI with starting and ending layouts. 
- Vectordrawable (UI Component)   AndroidX library to render vector graphics. 
- Android Jetpack VersionedParcelable (Utility)   Provides a stable but relatively compact binary serialization format that can be passed across processes or persisted safely. 
- Viewpager (UI Component)   AndroidX library to display Views or Fragments in a swipeable format. 
- AndroidX Widget ViewPager2 (UI Component)   replaces AndroidX ViewPager, addressing most of its predecessor’s pain-points, including right-to-left layout support, vertical orientation, modifiable Fragment collections, etc. 
- Google Material Design (Utility)   library to help with material design guidelines.