A simple rest library that consumes rest api in the background.

from The Android Arsenal
Integrated SocialLogin such as Facebook, Kakao, Naver, Line, Twitter, Google with RxJava and Firebase Authentication, written in Kotlin. This library is enhanced version of SocialLogin and fully rewritten in Kotlin and integrate with RxJava and Firebase Authentication.
This indicator will underline each tab text, morphing its size while scrolling.
A Simple, Customizable VectorAnalogClock View for Android.

OoOAlertDialog is a custom dialog for Android applications. With the library it is possible to add image, change font colors and buttons.

An Android Facebook image picker built using Kotlin, RxJava2, and Facebook's Graph API. The library allows the user to browse through their Facebook albums and images. This will require the Facebook app being used to have the "user_photos" permission. The library allows the user to select a number of photos and will return the associated preview and source URLs for the photo(s) selected. The sample app shows an example of how to use the selected Facebook image data to download and use the image(s) within an ImageView.