MouseCode Keyboard is available via Google Play.

Documentation is available at http://pantherkitty.software/mousecode/docs

What it is:

It's an Android soft keyboard that takes advantage of your current (or past) knowledge of International Morse Code. It allows you to type any character you might find on a typical PC keyboard (plus a few more) using just two fingers, with minimal need to look at the screen while using it.

At the present time, you can interact with it via two methods:

• The on-screen buttons
  
• The buttons on a bluetooth or USB mouse (requires Android 6.0 or newer).

Example Use Cases:

• Semi-blindly typing with one hand... possibly in situations where you should be looking at something else for safety or logistical reasons. By design, you can pause entry and/or deterministically return it to a known state at any time.
  
• Discreetly typing with one hand while holding the device (or a mouse) under a table, so you can pretend you're paying attention to something else.
  
• An assistive technology that enables people who are blind or have limited motion to type efficiently.