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!
Mood Chat (iOS Keyboard) - Add background sounds to your voice messages
FlorisBoard - An open-source keyboard for Android.
Linguix - AI-enabled writing tool for writers, editors, and businesses