Core

• EventBus - http://greenrobot.org/eventbus/
• Dexter - https://github.com/Karumi/Dexter
• RxJava - https://github.com/ReactiveX/RxJava
• RxAndroid - https://github.com/ReactiveX/RxAndroid

Maps and Location

• Mapbox - https://www.mapbox.com/
• Smart Marker - https://github.com/utsmannn/SmartMarker
• ReactiveLocation - https://github.com/mcharmas/Android-ReactiveLocation

Messaging

• Retrofit - https://square.github.io/retrofit/
• rmqa - https://github.com/utsmannn/rmqa

User and Database

• Backendless - https://backendless.com/

Messaging

• RabbitMQ - https://www.rabbitmq.com/