I've just discovered that Atlassian is giving away a full featured license of JIRA and Confluence at the incredible price of $5 each. It is a fully-functional license, the only limitation is the 5 users limit.
If you are interested in you don't have too much time to take a decision. It's a time-limited offer and it expires tomorrow.
I have been using JIRA and Confluence in a couple of project. As an open source project, the Zend Framework benefits of a free license of the full suite. It's a shame this offer doesn't include Crucible, I'm really looking forward to try it.
Altought I'm a really happy Redmine user, I don't rule out the possibility of purchasing a license. It could be useful, soon or later…