You can simply download the latest release or have a look t at the SourceForge File Repository.
To be able to use Josceleton artifacts via Maven, you first have to configure two repositories in your ~/.m2/settings.xml file:
<settings>
<profiles>
<profile>
<id>josceleton-profile</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<repositories>
<repository>
<id>josceleton-repo-snapshot</id>
<url>http://josceleton.sourceforge.net/maven/snapshot/</url>
<releases><enabled>false</enabled></releases>
<snapshots><enabled>true</enabled></snapshots>
</repository>
<repository>
<id>josceleton-repo-release</id>
<url>http://josceleton.sourceforge.net/maven/release/</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>false</enabled></snapshots>
</repository>
</repositories>
</profile>
</profiles>
</settings>