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.
It takes over 100mb of memory while running, and uses considerably more network bandwidth and CPU cycles than other chat clients (such as pidgin or trillian).
It often requires manually quitting before logging off or shutting down Windows, since Windows doesn't seem to be able to terminate the app. It also hangs up about 20% of the time when closed, requiring manual termination of the process using task manager.
Archiving features are meager and customizability of interface and features such as timestamp aren't up to snuff.
* Easy to use and install * Administrator control over many features * No ads, games or unneeded add-ons * Ability to store conversation and availability logs for specified time periods
* Unable to lock down a couple of features from end users
Very good open source based corporate IM. The only reason I didn't give it 5 stars is because I can't figure out how to lock down some of the features from end users like setting idle time. It may be possible but I haven't figured it out yet. I am serving this from my own machine to 100 end users and it hasn't effected performance on my end at all.