Android: Google's finally released an Android counterpart to its Chrome-based remote desktop application. Install the Chrome Remote Desktop extension for Chrome and now you can log in to your computer remotely from Android.
The app is free and requires surprisingly minimal setup. In our brief tests, the connection was incredibly smooth both over Wi-Fi and LTE (though your mileage may vary). The app is just now rolling out to the Play Store so it may take a bit for it to propagate to your device. If it hasn't shown up for you, Android Police has a handy APK download at the via link below.
Chrome Remote Desktop | Google Play Store via Android Police