SSCustomBottomNavigation is a customizable bottom bar library with curved animations.
The actual features are:
A floating navigation view for listing items dynamically on Android.
Tab Stacker is an Android library that handles Multiple Fragment History (Back Stacks), like it is done on iOS Apps.
Universal router comes with two flavor, the core module which basically a link router that can convert your URI to whatever you need, and the Android module which more opinionated to how you can use it to help you solve your navigation problem.