ZK Playground (https://play.zkaccel.io ) is an interactive web-based development environment that allows anyone to test zkSNARK circuits on top of FPGAs, using the libraries of their choice: Circom, gnark or ZoKrates.
Developers, both experts and beginners, can now fast and effortlessly experiment on new creative ZK systems, from the comfort of their browser.
The playground currently uses open-source FPGA accelerator designs, with limited performance, but it will be soon powered by the new InAccel FPGA accelerators.