Also called "Chat Programs". These applications are installed on a PC by a user, and allow immediate "chats" between other users of the program. Some of these programs also allow audio or video conferencing as well as the ability to execute file transfers.
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File transfer
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Spark is a full-featured instant messaging (IM) and groupchat client that uses the XMPP protocol. The Spark source code is governed by the GNU Lesser General Public License (LGPL), which can be found in the LICENSE.html file in this distribution. Spark also contains Open Source software from third-parties. Licensing terms for those components is specifically noted in the relevant source files.
