It's a fairly safe bet that almost any homebuilt that is strut-braced or wire-braced, wood or steel-tube, using either an A65 or a VW engine, is Sport-Pilot-Eligible. You will find exceptions, in that a few designs were optimized for speed.
Note that there's no official list...it's up to you to pick a design that meets the Sport Pilot requirements. I figure these qualify with no question:
Bowers Fly Baby
Pietenpol Air Camper
Pober Pixie
Corbin Baby Ace
Evans Volksplane
Smith Miniplane
Baby Great Lakes
Flaglor Scooter
Aerosport Scamp
Der Kricket
Issacs Fury
Sorrel SNS-2 Guppy
Woody Pusher
EAA Biplane
Skyote
Stolp V-Star
Taylor Monoplane
Good references for these older designs are Budd Davisson's
The World of Sport Aviation, and Peter M, Bowers'
Guide to Homebuilts, Ninth Edition. Both are long out of print, but can be often found in used book stores.
There are other designs that *could* qualify, depending on your actions when building. For instance, some have gross weights over the 1320-pound limit. If you build the aircraft, you can list a lower gross weight. I left a number of older designs off the above list as their speeds "as advertised" approached or exceeded the Light Sport limit. In reality, one could argue that the actual attainable speeds are less and the aircraft therefore qualifies.
Here's a summary of what qualifications are necessary:
Ron Wanttaja