5 links
Java Secure Socket Extension
java.sun.com
Sun's official extension for SSL communication in Java. API allows third party library being used as a provider.
Network Security Services libraries
mozilla.org
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 Comm…
SSL Library
ssllib.sourceforge.net
Java Library. Implements SSLv3 and backward compatible SSLv2. [Open Source]