Found this list on a blog. My dad grew cow horn. I like Clemson Spineless and Emerald.
Red Burgundy - Four foot tall plants with six to eight inch maroon pods, some of the color even extends into the plants leaves and stems.
Silver Queen Okra - Tall six foot plants produce tender pale whitish-green pods.
Star of David - This Israeli heirloom grows pods that have a very unique shape and strong flavor from okra plants reaching up to seven feet.
Alabama Red - A heirloom okra originating from the state of Alabama produces unusual fat red pods.
Cow Horn - This giant okra variety can grow eight feet tall and supply the cook with large yields of slender pods reaching ten inches in length without becoming woody.
Louisiana Short - A prolific producer of tasty and extremely plump six-inch pods.
Hill Country Heirloom Red - This okra variety is a Texas heirloom with attractive reddish-green pods.
Burmese Okra - An early yielder, this heirloom from Burma will continue producing pods for the kitchen until fall frosts arrive.
Jade - High yields of early maturing dark green okra pods on four foot tall plants.
Emerald - Early, unique smooth-round pods, this may be the okra variety that my grandfather grew years ago in his Southern Maryland garden.