Phonograph by Karim Abou Zeid

AOSP Support Libraries by AOSP contributors

Glide by Sam Judd

Retrofit by Square team

OkHttp by Square team

Koin by Arnaud Giuliani

Material Dialogs and Cab by Aidan Michael Follestad

Material Contextual Action Bar by Aidan Michael Follestad

Android In-App Billing v3 Library by Henning Dodenhof

Advanced RecyclerView by Haruki Hasegawa

Custom Activity on Crash by Eduard Ereza Martínez

NanoHttpd by NanoHttpd Team

Circular Seekbar by Tankery

jAudioTagger by Kanedias

Android Fast Scroll by Zhang Hai

Image Picker by Dhaval Patel

Material Intro by Jan Heinrich Reimer

Slidr by Drew Heavner

FadingEdgeLayout by bosphere

Icons by Austin Andrews

Material Design City Wallpaper