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lwIP [BSD]

http://savannah.nongnu.org/projects/lwip/

一个轻量TCP/IP协议栈 广泛用于嵌入式设备

架构优秀 移植简单 适合阅读学习

libcoap [GPL/BSD]

https://github.com/obgm/libcoap

CoAP协议栈,A CoAP (RFC 7252) implementation in C, simplified BSD

wolfssl [GPLv2]

wolfSSL (formerly CyaSSL) is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud.

嵌入式设备可用TLS/SSL加密实现 闭源商用5k刀每产品

civetweb

https://github.com/civetweb/civetweb
Embedded C/C++ web server