Lightweight installer generator: IzPack

IzPack is an installers generator written in Java. It produces lightweight installers that can be run on any operating system where a Java virtual machine is available. Depending on the operating system, it can be launched by a double-click or a simple 'java -jar installer.jar' on a shell. The most common use is to distribute applications for the Java platform, but you can also use it for other kinds of projects.

Features:

• XML-based installer descriptors
• Uses the maximum Jar archive compression level
• Jakarta Ant integration
• Great flexibility and modularity, it is very easy to extend IzPack
• No native code is required, but you can extend IzPack with native code
• Shortcut creation system
• Flexible and powerful user input panel
• Automatic uninstaller creation
• Easy localization with XML langpacks: 16 langpacks are provided by default
• Variable substitution system
• OS-specific scripts interaction

You can read more on the IzPack homepage