• RxActivityResult - A reactive-tiny-badass-vindictive library to break with the OnActivityResult implementation as it breaks the observables chain.
• RxAnimations - Repository for android animations Rx wrapper
• RxBinding - RxJava binding APIs for Android's UI widgets
• RxLifecycle - Lifecycle handling APIs for Android apps using RxJava
• RxPaparazzo - RxJava extension for Android to take images using camera and gallery
• RxRecyclerView - Reactive RecyclerView Adapter

• ReactiveCache - A reactive cache for Android and Java which honors the Observable chain.
• Rx Preferences - Reactive SharedPreferences for Android
• RxCache - Reactive caching library for Android and Java
• RxCupboard - Store and retrieve streams of POJOs from an Android database using RxJava and Cupboard
• RxFileObserver - Simple reactive API for Android's FileObserver class
• RxFileWatcher - Convenient file watcher with an RxJava interface, based on JDK WatchService
• RxLoader - An Android Loader that wraps an RxJava Observable.
• RxStore - A tiny library that assists in saving and restoring objects to and from disk using RxJava.
• SQLBrite - A lightweight wrapper around SQLiteOpenHelper
• StorIO - Beautiful API for SQLiteDatabase and ContentResolver

• ReactiveNetwork - Android library listening network connection state and change of the WiFi signal strength with RxJava Observables
• Retrofit - Type-safe REST client for Android and Java
• RxBonjour - Reactive network service discovery
• Wasp - Compact and easy to use, 'all-in-one' android network solution

• RxMocks - Mocks/Assertions for RxJava testing
• RxPeople - A library with fluent API for generating random user data
• RxPresso - Easy Espresso UI testing for Android applications using RxJava

• Android-ReactiveLocation - Rx wrapper around Google Play Services API
• Frodo - Android Library for Logging RxJava Observables and Subscribers.
• ReactiveAwareness - Android library to quickly and easily get the users context using the Awareness API and RxJava
• ReactiveSensors - Android library monitoring hardware sensors with RxJava Observables
• RxAndroidBle - RxAndroidBle is a powerful painkiller for Android's Bluetooth Low Energy headaches
• RxBillingService - RxJava 2 extension for Android In-App Billing version 3
• RxBroadcast - Reactive Broadcast and LocalBroadcast for Android
• RxClipboard - RxJava binding APIs for Android clipboard
• RxFcm - RxJava extension for Android Firebase Cloud Messaging (aka fcm)
• RxFingerprint - Android Fingerprint authentication and encryption APIs wrapped in RxJava
• RxFirebase - RxJava wrapper on Google's Firebase for Android library
• RxFit - Reactive Fitness API Library for Android
• RxGcm - RxJava extension for Android Google Cloud Messaging
• RxGoogleMaps - Rx wrapper around GoogleMaps
• RxGpsService - An Android service to retrieve GPS locations and route stats using RxJava
• RxJava2Debug - RxJava 2.x extension to provide meaningful Stack Traces
• RxLocation - Reactive Location APIs Library for Android and RxJava 2
• RxPalette - RxJava bindings for the Palette library on Android
• RxPermissions - Android M runtime permissions powered by RxJava
• RxPermissionsResult - Ask for permissions without breaking the observable chain
• RxRelay - RxJava types that are both an Observable and an Action1.
• RxSocialConnect-Android - OAuth RxJava extension for Android.
• RxTuples - RxTuples is a library to smooth RxJava usage by adding simple Tuple creation functions
• RxWear - Reactive Wearable API Library for Android

Just keep these simple rules:

• Alphabetical order
• 1 lib / pull request
• Submit good quality, mature libs. Libraries should have a descriptive README with usage examples and download urls at the very least.