The NextApp Technical Keyboard is a derivative of the AOSP keyboard, with added arrow keys and other special keys, and a slightly tweaked QWERTY layout that is closer to that of a PC Keyboard.
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Keeble Alternatives
Keeble is described as 'Allows students and adults with physical or vision impairments to type in any app' and is an app in the education & reference category. There are more than 25 alternatives to Keeble for a variety of platforms, including Android, Android Tablet, F-Droid, iPhone and iPad apps. The best Keeble alternative is FlorisBoard, which is both free and Open Source. Other great apps like Keeble are AnySoftKeyboard, Simple Keyboard, Microsoft SwiftKey and Unexpected Keyboard.