A.R. Emoji Custom Keyboard 4+ - A.
Kika Keyboard - Kika Emoji Keyboard is an instinctive, expressive and universal keyboard app.
Phraseboard Keyboard - Phraseboard Keyboard is a free to use mobile application that customizes and categorizes your Keyboard with easy to access phrase.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
WordBoard - Save time typing on your phone
AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.