AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Facemoji Keyboard - The Facemoji keyboard is definitely one of the better keyboards out there. Feature wise, the app does not disappoint, and in fact, has all of the things that users would want from a keyboard app.Experience is smooth and the keyboard works flawlessly
FlorisBoard - An open-source keyboard for Android.
Grammarly Keyboard - If you want your mobile writing to truly shine with its polish, you need the Grammarly Keyboard
Hacker's Keyboard - Are you missing the key layout you're used to from your computer when using an Android device?