Here is a versatile slider that lets you do more with your video camera. The Waterbird Multislider has linear and curve camera tracks. You can control your camera on it manually or using a mobile app. The slider is available in multiple sizes, with the 49 inch version allowing you to create full circle effects.
The kit comes with control unit, motor, belt, pulley, camera cable, and app. The Multislider simply lets you get more creative with your camera. You can find it here.