Used OpenSource Libraries:

Crashlytics - https://github.com/crashlytics
Realm - https://github.com/realm/realm-java
SystemBarTint - https://github.com/jgilfelt/SystemBarTint
MaterialDialogs - https://github.com/afollestad/material-dialogs
MaterialDesign - https://github.com/navasmdc/MaterialDesignLibrary
PreferenceFragment - https://github.com/Machinarius/PreferenceFragment-Compat
Payment - https://github.com/jberkel/pay-me
JodaTime - https://github.com/JodaOrg/joda-time
Android Charts - https://github.com/PhilJay/MPAndroidChart
CountryCodePicker - https://github.com/chathudan/CountryCodePicker
MailChimp - https://github.com/Ecwid/ecwid-mailchimp
UndoAction - https://github.com/jenzz/Android-UndoBar
BetterPickers - https://github.com/derekbrameyer/android-betterpickers
Showcase - https://github.com/amlcurran/ShowcaseView
ToolTips - https://github.com/sephiroth74/android-target-tooltip
Dexter Permissions - https://github.com/Karumi/Dexter
ViewPagerIndicator - https://github.com/JakeWharton/ViewPagerIndicator
Facebook SDK - https://github.com/facebook/facebook-android-sdk
GSON - https://github.com/google/gson
Picasso - https://github.com/square/picasso
PugNotification - https://github.com/halysongoncalves/Pugnotification