Keyboard Skins for iPhone - Keyboard Skins for iPhone is known as a keyboard extension that comes with cool designs, colors, and customizable stuff that change your standard keyboard theme.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Neon L.E.D. Keyboard - Neon L.
Fleksy - Fleksy is the #1 private, white-label virtual keyboard SDK, enabling companies to create unimaginable products.
Live Keyboard Plus - Live Keyboard Plus is a keyboard application designed for both personal and professional use.
AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.