Language- and platform-independent protocol for peer-to-peer networking, developed by Sun. Initial implementation in Java. [Open Source, BSD-like]

A class libraries for Java enable you to write applications to access, manage, update, and search for information stored in directories accessible using LDAPv3. Contributed by Novell. [Open source]

A small, simple, powerful framework; to dynamically link Virtual Machines into a seamless continuum. It is a 'drop-in' architecture, requiring no application redesign to use it. [Open source, LGPL]

Architecture for constructing dialogue systems. Its plug-and-play approach enables developers to combine architecture-compliant commercial software and cutting edge research components. [Open source]

Implementation of the SOAP protocol - a lightweight protocol for exchanging information, based on XML. HTTP and SMTP (i.e. email) transmission are both supported. [Open Source, BSD-like]

Implementation of the ISO-8583 protocol - acts as a framework for financial exchange/payment. It can be used to implement EFT interchanges, switches, payment gateways, POS software and e-commerce sites. [Open Source, GPL]

A Java class library that implements the SyncML data synchronization protocol. Also a standalone SyncML server and client.

A light Java implementation of a ANSI/VT terminal with both Swing and AWT.

An alternative to RMI which does not require the use of java.rmi.Remote and uses an unchecked substitute for RemoteException, so that "throws RemoteException" is no longer needed. [Open Source, BSD-like]

Free implementation of the SSL v3 and TLSv1 (RFC2246) protocols. Now freely downloadable due to a change in US export rules. [Open Source, BSD-like]