Split keyboard (gboard) working - sort of... : r/surfaceduo
Android M Preview: Multi-Window and Split Keyboard - YouTube
Real split keyboard app? : r/androidapps
How to Get a Split Keyboard on an Android Tablet - YouTube
Amazon.com: Kwumsy Portable Monitor Split Screen Keyboard Mechanical Multifunctional Keyboard with Built-in 12.6'' Touchscreen USB Expansion Compact 71 Keys RGB LED Backlit N-Key for Windows Mac Android (K2) : Video Games
Mechanical Keyboard, Built-in 12.6 Inch Touchscreen, Compact 71 Keys RGB LED Backlit N-Key Multifunctional Split Screen Keyboard for Mac Windows Android - Black