The tacos-core module provides components and ajax behaviour for the Tapestry 5.
To get the latest snapshot release, just add a dependency to it in your pom.xml. The snapshots are available on http://tacos.sourceforge.net/nightly/.
<dependency>
<groupId>net.sf.tacos</groupId>
<artifactId>tacos-core</artifactId>
<version>5.0.0-SNAPSHOT</version>
</dependency>