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!
Hot Virtual Keyboard - A replacement for Windows' built in virtual touch keyboard.
Hacker's Keyboard - Are you missing the key layout you're used to from your computer when using an Android device?
On-Screen Keyboard Portable - a virtual keyboard to go