As an Open-Source software, you are invited to contribute to JForum. There are many areas where you can help, like making documentation, new styles, buttons, mods and even helping to develop the core source-code.
We'll have more information in this page soon, but a good start point is the forums. You can also send an email to JForum's project leader, Rafael Steil, at rafael _[at]_ insanecorp.com.

JForum does not uses JSP for content display, but a template engine, which offer much more ease of development and maintaince. The template engine used is FreeMarker.

Contributors
A project only evolves with feedback of users and contribution - be it programming, documenting, making graphics and so other many areas - of so many valuable people. Here are some of who have helped to improve JForum:

People come and go all the time. Many times we receive help because an user needs some feature more quickly, or then he / she got some free time to contribute for a while, and is that kind of contribution which makes the project grow up. You are welcome to join us.

Bug and Issue Tracker
JForum issues are tracked by JIRA, by Atlassian. You can see the current issues, ask for new features and submit bug reports at http://www.jforum.net/jira

Getting the source code from CVS
The CVS repository is hosted by Java.net. Below is listed the host access options:

Setting up your development environment
First of all, create an empty file named jforum-custon.conf in the directory WEB-INF/config .This file is necessary when working on teams, since you should not change SystemGlobals.properties to put your own configuration data, like passwords and forum address. After creating the file, just add it to .cvsignore.

You can follow the install instructions clicking here

The best start point is src/net/jforum/JForum.java, which is the Front Controller implementation. src/net/jforum/entities contains all entities used in the system, src/net/jforum/model have the interfaces used to persist and retrieve data and src/net/jforum/view contains all view related actions.

Getting help
The best place to ask for help is in the forums / Community section. Click here to go there.