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. (License: GPL v2 and commercial)
wolfSSL focuses on creating high quality, portable, embedded security software. Current products include the CyaSSL embedded SSL library, the wolfCrypt embedded crypto engine, and the yaSSL Embedded Web Server. (License: GPL v2 and commercial)