A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
It's mind boggling how a small controller like the open source SplitFox Pro packs a split layout with 18 buttons into its little frame!
The Starburst is a mini leverless controller with 15 buttons, and you can tilt it to more than one angle for the comfort of your wrists.
If you don't need 16 or more buttons: the VSLAB VSNOVA N14 is a fine option with chamfered acrylic, customizable art, and cool LED.
The Split is divided into two halves connected through a coiled detachable cable—and should be compatible with future modules by Ultra Arcade.
The TIKITAKA M3 doesn't have 16 buttons. It has 17, and the 17th button is a rare fully sized start button on the top panel's upper left.
The FRS Mini is a mini version of the bestselling FRS by Furin Arcade, and its 16 buttons mean that you have access to a dual layout.
The SticklessBox features a rare combination of Sanwa buttons and the GP2040-CE firmware—plus a convenient carrying handle.
The CounterHit Compact is the creation of a Seattle engineer, and its loop lets you attach the tiny CounterHit Nano controller.