AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Lingvanex Translator for Slack - Auto-translate messages, documents and images in Slack
FlorisBoard - An open-source keyboard for Android.
Inspector Spacetime from Google - Google Translate for engineers working with motion