AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Free Virtual Keyboard - Free Virtual Keyboard is a free, lightweight, multilingual and finger friendly virtual keyboard.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Onboard on-screen keyboard - An onscreen keyboard useful for tablet PC users and for mobility impaired users.
FlorisBoard - An open-source keyboard for Android.
Hot Virtual Keyboard - A replacement for Windows' built in virtual touch keyboard.