This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Yes. One is Paddle-Adapple from Southern California Research Group. It is a small external card with sockets for the joysticks. A ribbon cable runs into the Apple II and plugs into the 16-pin Game socket. As noted in the "for Apple II, //e, & Franklin" model's data sheet, Paddle-Adapple lets you switch between two sticks; or, with the switch set to "A" plus proper jumper settings, you can access two two-button sticks. The jumpers also allow programming the card for different X-Y and button configurations. By: Rubywand
 
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