All official releases are available off the Sourceforge Downloads page.
Release notes can be found here, Heritrix Release Notes.
For prerelease code, you can access our continuous build box. The latest build can be found by clicking on the 'Build Artifacts' link.
Please be aware that such distributions have been made from code work in progress, and is most appropriate for developers and advanced operators. It has not received the same testing, review, and documentation as official releases, and at times may not be stable enough to work at all.