- Edited
As this seems to be a recurring topic, especially among newcomers, I am listing here the modules that I know for the Android platform. Keep in mind that to use these modules you will need to recompile the engine.
Ads Admob (Android & iOS) - https://github.com/jlopezcur/GodotAdmob ** Admob - https://github.com/Shin-NiL/bbAdmob Appodeal - https://github.com/carlosmarti/GodotAppodeal Adbuddiz - https://bitbucket.org/reTTT/godotadbuddiz Chartboost - https://bitbucket.org/reTTT/godotchartboost Chartboost (Android & iOS) - https://github.com/beocat/mamau_chartboost Heyzap - https://github.com/Shin-NiL/GodotHeyzap Admob (Firebase) - https://github.com/FrogLogics/GodotFireBase
Google Play Game Services https://github.com/ranmaru90/Play-Game-Services-Android-Module-for-Godot https://github.com/jlopezcur/GodotGooglePlayGameServices * https://github.com/FrogLogics/GodotFireBase https://github.com/xsellier/godotandroid
Analytics https://github.com/jlopezcur/GodotGoogleAnalytics https://github.com/FrogLogics/GodotFireBase https://github.com/kamilors/Godytics https://github.com/xsellier/godotandroid
Sharing Text Sharing - https://github.com/jlopezcur/GodotShare Module for sharing images on Android - https://github.com/vanyasem/Godot-ShareImage Module for sharing text and/or image (Android & iOS) - https://github.com/Shin-NiL/Godot-Share * **
Misc Facebook App Invite - https://github.com/Shin-NiL/shinnilfb * Speech-To-Text - https://github.com/literaldumb/Godot-SpeechToText Vibration - https://github.com/literaldumb/GodotVibrate Vibration - https://github.com/Shin-NiL/Godot-Mobile-Vibration Wrapper for the Toast.makeText functionality - https://github.com/literaldumb/GodotToast Custom speech to text - https://github.com/literaldumb/Godot-CustomSpeech Module for requesting runtime Android permissions - https://github.com/vanyasem/Godot-AndroidPermissions Local notification - https://github.com/DrMoriarty/godot-local-notification AmazonGameCircle and Amazon IAP - https://github.com/JoshNinetySeven/godot-amazon-android-module Various Android services (GPGS, Facebook, Firebase, Sharing) - https://github.com/xsellier/godotandroid GodotRateIt allows you to ask your user to rate your app - https://github.com/xsellier/godotrateit Android amazon services - https://github.com/xsellier/godotamazon Android local notification - https://github.com/BinogureStudio/godotlocalnotification
* Tested by me and working fine on Godot 2.1 ** Tested by me and working fine on Godot 3.0