IzPack is an opensource java packaging tool that allows you to provide user an easier installation guidelines. There are not much java packaging tools out there that has the same quality features as izpack.
1. It is free and opensource - Needless to say everyone loves free stuff. Open source also allows flexibility and easier maintainability.
2. Great documentation and wiki - It uses confluence to track documentations and defects. It also as good FAQ to refer to for first time users.
3. Active community - The tool is greatly supported and changes are still ongoing. Although I feel that it is not a big community the active once are really helpful.
4. Cross-platform - This feature is a must since the one they are packaging are java applications. This will allow you to provide great services to
5. Customizable - This helps you to distinguish your product even during the installation stages.
This blog post are only based on personal feedback and experience based on the application. You can download the application through http://izpack.org/