Android Arsenal

A categorized directory of libraries and tools for Android

Android Asset Studio

A collection of tools to easily generate assets such as launcher icons for your Android app.

Android Design

Site to help aid developers in the creation of applications

Android Developer Website

Android Studio

IDE from Google for making Android apps

Android Studio Screencasts

Android Studio Tutorial for Beginners (Step by Step tutorial)

YouTube videos.

Android Training

Android Tutorials

Mobile Tuts+ Android tutorials

Android version distribution history

App Inventor

Originally from Google labs, now at MIT, easily create Android apps

AppsGeyser

Free app creator. They make money based on advertisements.

Build Your First App

from Android Developers

Dagger

Dependency injection framework

Developing Android Apps by Google

Free course at Udacity.

Firebase Test Lab for Android

Cloud-based infrastructure for testing Android apps.

HTCdev - Android Basics

Material Design

Material Design Color Palette

Pick a primary color and an accent color get the colors for a material design palette.

Model View Presenter Tutorial

RxJava

A Java API for asynchronous programming with observable streams.

Vsyor

Display your Android device on your computer screen.