The current documentation can now seen here: https://top-logic.github.io/ant-contrib/intro.html
This is a fork of the Ant Contrib project (http://ant-contrib.sourceforge.net/). At the time of the fork (October 2011) the project had been inactive for a number of years with developers citing lack of time to support it.
In the meantime, many user contributed patches and additions have been posted to SourceForge forums (https://sourceforge.net/p/ant-contrib/_list/tickets). A git fork seemed like a no brainer...