A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
Despite its small size, the Kylinix L14 manages to fit in 14 buttons, three USB ports, and more goodies that may appeal to you.
The Kylinix K15 is a spacious yet light & slim controller with more buttons than usual, and the buttons can even glow.
Just when you thought 16 buttons are a lot for a leverless controller, GuileKeys released the GK-21, which has 21 buttons!
As a spinoff from its legendary Panzer series, The Frame by Jasen's Customs is an aluminum-acrylic hybrid with a customizable layout.
FlatboxLab's bigger Flatboxes can feature sick art that can also show through the buttons, which have hot swappable switches.
The Mytrix M16 is one of those thin stickless controllers that have 16 buttons laid out in a way that also gives you access to a WASD layout.
The Keybox Maverick is a handmade controller that is inspired by the SNES controller, and you can mix & match its colors as you like.
The Haute42 S16-C is like the previous S16 but on steroids: it comes preinstalled with the fast Crystal switches!