Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Typing Speed Test - A simple typing test to see how fast you can type
Emoji Keyboard - Allows searching and inserting into other applications near thousand emojis.
keyboardlayouteditor - Powerful, visual designer for designing and editing keyboard layouts.
Swiftkey - SwiftKey keyboard allows for seamless typing and adapts to the way you type, so you can spend less time correcting typos and more time saying what you mean.
Big Quick Keyboard - Big Quick Keyboard is an Android keyboard that mimics the layout of the desktop keyboard.