The distribution page directs you to the versioned releases. They have passed the test scenarios.
The source link points to the snapshot builds. These builds are not versioned, but timestamped.
Snapshots are built every day, and made available when nontrivial changes are made to the code base.
Snapshots are built from JUnit PDF Report trunk.
Snapshots are built with Ant trunk.
Snapshots are tested with JUnit trunk.
Snapshots essentials is distributed with Fop trunk.
Thank you Oregon State University - Open Source Lab for providing the snapshot environment.