Jeremy g. designed a mashup between an Arduino Uno and a Xilinx 9536XL CPLD:

CPLDuino

The XCACDV3, CPLDuino is a single board solution to meld Atmels ATmega 328 RISC microcontroller with a Xilinx XC9536XL¹ CPLD. Allowing for rapid prototyping of digital circuits without the need for a breadboard. The CPLDuino is capable of passing information from the on board ATMega328 to the CPLD and vice versa, allowing for real-time data monitoring. Thanks to the on-board CP2102 USB to Serial UART, data can be viewed and manipulated via the virtual com port.