Realtek Ameba-1 development board (RTL8195AM/RTL8710AF) is an IoT-Ready MCU that is based on ARM Cortex-M3. It is specially deisgned to be pin-compatible with Arduino UNO board and can run most of the Arduino base example without an issue.
What's more, it comes with many useful features that make it a lot easier for quick IoT project prototying, features include but not limited to,
I2S for audio
All examples and source code can be found on AmebaIoT.com.
A quick demo of what this soc is capable of can be found here