Building and modding the Ploopy trackball - The Verge
Split keyboard database
Trackball for Split Keyboard Users : r/Trackballs
Ultimate Hacking Keyboard - The keyboard. For professionals.
The Space Between You and Me | Eiji Onchi
Ergonomic Keyboard, 2 in 1 Split Keyboard and Trackball Mouse Combo Design wi... | eBay
Amazon.com: Logitech Ergo K860 Wireless Ergonomic Keyboard with Wrist Rest and MX Ergo Wireless Trackball Mou : Electronics
Oddball - a split keyboard with trackball
Amazon.com: Ergonomic Keyboard, 2 in 1 Wireless Computer Keyboard and Trackball Mouse Combo Design with Wrist Rest, Split Keyboard, USB Keyboard for Windows/Mac/Laptop/Computer/PC-Black : Electronics