GNU TLS - http://www.gnu.org/software/gnutls/ An Open Source implementation of TLS 1.0 Internet protocol as described in RFC2246. [GPL]
Yet Another SSL - http://www.yassl.com The yaSSL software package is an open source, dual licensed implementation of SSL. It includes SSL client libraries and an SSL server implementation.
Network Security Services libraries - http://www.mozilla.org/projects/security/pki/nss/ 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]
MatrixSSL - Open Source Embedded SSL - http://www.matrixssl.org MatrixSSL is an open source embedded SSL implementation under 50K. It is designed for small footprint devices and applications requiring low connection overhead.
RSA BSAFE - http://www.rsa.com/node.aspx?id=1204 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)
SecureBlackbox - http://www.eldos.com/sbb/ Delphi/Kylix component and ActiveX/DLL library [Commercial]
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