Smack legacy extensions. Usually XEPs in the state 'retracted', 'rejected', 'deprecated', 'obsolete' or in a long standing 'deferred' state.
'org.igniterealtime.smack:smack-legacy:4.0.2'
<dependency>
<groupId>org.igniterealtime.smack</groupId>
<artifactId>smack-legacy</artifactId>
<version>4.0.2</version>
</dependency>
<dependency org="org.igniterealtime.smack" name="smack-legacy" rev="4.0.2"/>
"org.igniterealtime.smack", "smack-legacy", "4.0.2"