MatrixSSL is an open source embedded SSL implementation under 50K. It is designed for small footprint devices and applications requiring low connection overhead.
NSS implements SSL v2 and v3, TLS, PKCS#5, PKCS#7, PKCS#11, PKCS#12, S/MIME, X.509v3 certificates, and other security standards. These libraries are used by Mozilla / Netscape Communicator and server products. [Open Source]
It includes everything needed for delivering SSL-enabled applications developed in C, C++, or Java. It is not subject to US export control. [Commercial] (RSA Data Security)