1. \Middlewares\lwip-1.4.1\
lwIP is freely available under a BSD license.The source code is derived from "http://download.savannah.nongnu.org/releases/lwip/".

2. \Middlewares\FreeRTOS\FreeRTOSv202012.00\
FreeRTOS is freely available under a MIT license.The source code is derived from "https://freertos.org/".

3. \Middlewares\RealThread\Pack\RealThread.RT-Thread.3.1.5.pack
RT-Thread 3.0 is freely available under a Apache License 2.0.The source code is derived from "https://www.rt-thread.org/download/mdk/".
