AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Linguix Keyboard - Check grammar instantly in real-time in your favorite apps
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
OftenType - Keyboard app with custom quick keys for often used texts.
FlorisBoard - An open-source keyboard for Android.
Vocal - Vocal is a platform to discover and support creators.