AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Text Blaster - Send thousands of text messages with one tap on Android
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Botnik - This Slack bot helps your team build transparency & empathy
FlorisBoard - An open-source keyboard for Android.
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!