A WASD controller often has a combination of WASD keys on the left and arcade buttons on the right. Of course, there can be other variations as well.
AllFightSticks provides DIY cases in different sizes, such as the 15.5" Prototype Steel Aluminum Hybrid case.
Certain Deth is a Detroit-based outfit that provides custom enclosures and builds with key, button, or joystick directional inputs.
The Titan is loosely based on the Sega Saturn controller, and one of its many unique features is having a customizable encoder knob.
The Stress Pocket Arcade Fight Pad is a mini WASD controller with unusual angles that may appeal to you more than the usual layout.
This mini all-keys controller made of aluminum and acrylic can be ordered in leverless or WASD formats with various switches.
The 4TW cast-acrylic case by jonyfraze can be ordered in preassembled or DIY formats as well as different layouts and art.
The KeebFighter-01 is Mavercade's ultra-thin minimalistic leverless controller with slanted keys, a spacebar, and six auxiliary buttons.
The Haute Board Mini is a mini WASD controller by Haute42 that is minimalist, elegant, and sleek, packing LEOBOG Graywood switches.