Android TV Remote Control - Android TV Remote Control is free to use application that allows you to take control of your Android TV.
AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
RemoteNOW - RemoteNOW is a TV controller application that comes with a virtual way to deal with your Android TV.
Hacker's Keyboard - Are you missing the key layout you're used to from your computer when using an Android device?
Mi Remote controller - Mi Remote controller is a reliable free to use application that allows you to control any electric appliances with your phone.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!