Sorry for the late reply but I have just seen your question/post now as I have not received any notification.
HydraBus is low cost Open Source Hardware and Software platform with a high performance 168MHz ARM Cortex M4F MCU
For more details see
http://hydrabus.com/hydrabus-1-0-specifications/
Main problem today for ESP32 support is to test it as I have not any ESP32 for test and the actual design is done with ESP32Beta board I need to check with final ESP32 version and check all work fine.
Best Regards,
Benjamin