Banana Board
This is a moveable mouse platform that slides out either to the right or the left, as needed.  When you slide out the mouse platform, the tray has a 'banana' shape. Informational websites: http://www.workriteergo.com

Butterfly Boards
Based on the concept of working in a reclining position by providing a tilted work plan that supports the arms along with the keyboard and mouse. The Butterfly Board allows the user to recline further back in the chair. Informational website: http://www.lifewithease.com

Magic Arm Device Adapter
Mounting system that attaches securely to just about anything including wheelchair tubing, desks and tables. Informational website: http://www.rjcooper.com/

PowerBoard Lap Tray
The PowerBoard is a lap-held keyboard platform, designed as an easy way to use a keyboard without modifying the workstation. Informational website: https://www.arcergo.com

Sit-Stand Tray and Monitor Lift
This is a terrific alternative when sit-stand is required and you want to keep an existing desk in place.  Simply add this mechanism to it.  The Sit-Stand Arm can be adjusted from 9" below to 13" above the desk surface. Informational website: http://www.airtech.net