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.
What's new in this version:
Version 2.6.3 fixed issues with login screen shows disabled fields, search in history is not working, and NPE when exiting a chat window with ESC.