wolfSSL is described as 'offers an embedded SSL implementation that is portable, progressive, and easy to use with products including the wolfSSL embedded SSL library and the wolfSSL Embedded Web Server'. There are five alternatives to wolfSSL for a variety of platforms, including Windows, Linux, Mac, BSD and Haiku. The best alternative is OpenSSL, which is both free and Open Source. Other great apps like wolfSSL are LibreSSL (Free, Open Source), GnuTLS (Free, Open Source), mbed TLS (Free) and SharkSSL (Free Personal).
mbed TLS (formerly known as PolarSSL) makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.
The SSL/TLS and Certificate tutorial for Windows enables you to fast track your understanding of the SSL/TLS protocol, Certificate Management, and secure communication. The download includes many C source code examples, including a secure WebSocket tutorial.