Ubuntu on-screen keyboard

 Ubuntu Keyboard based on Maliit-Keyboard
 .
 Maliit provides a flexible and cross-platform input method framework. It has a
 plugin-based client-server architecture where applications act as clients and
 communicate with the Maliit server via input context plugins. The communication
 link currently uses D-Bus. Maliit is an open source framework (LGPL 2) with
 open source plugins (BSD).
 .
 Ubuntu-Keyboard on-screen keyboard is a Maliit plugin.