Here’s an open source hardware development board for Espressif audio development framework, the ESP32-ADF, from Olimex:
With ESP32-WROOM-B module with 8MB RAM and 4MB of Flash, two microphones, two 3W speakers, codec, amplifier, Lipo charger, USB with programming, Audio 3.5mm jack, ESP32-ADF board offers everything you need to start playing with Espressif Audio Development Framework.
Check out the video after the break.