These are resources for developers of QuickFIX/J, not the developers who use the tool.
Source code is available from the SourceForge Subversion repository. Information on accessing the repository can be found here. You can also browse the Subversion repository.
As the SourceForge Subversion documentation states, you'll generally want to checkout the trunk rather than the root of the repository.
svn co https://svn.sourceforge.net/svnroot/quickfixj/trunk quickfixj |
Jira is used for issue/bug tracking and release management. It can be found here.
Cruise control information is here.