Install the cq5-archiva-servlet-1.6.zip. (It may fail to load on CQ 5.2.1, but ignore the message then install.)

Configure your project pom.xml to use your local CQ5 instance as a maven repository

<repositories>
        <repository>
            <id>localinstance</id>
            <name>CQ 5.x localinstance</name>
            <url>http://localhost:4502/maven/repository</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
 </repositories>
 <pluginRepositories>
        <pluginRepository>
            <id>localinstance</id>
            <name>CQ 5.x localinstance</name>
            <url>http://localhost:4502/maven/repository</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
 </pluginRepositories>

Additionally, you can use as parent dependency the following:

    <parent>
        <groupId>com.day</groupId>
        <artifactId>cq5-parent</artifactId>
        <version>5.6.0</version> (if for example your instance is a 5.6.0)
    </parent>

The groupId/artifactId is configurable with Sling configuration, and the version is not important. (But make sense to use according to target, such as 5.2.1/5.3/5.4).

In your .m2/settings.xml, add the following lines to define the login/password:

<server>
      <id>localinstance</id>
      <username>admin</username>
      <password>admin</password>
</server>

Additionally, you can add your jar/pom in the "/var/maven/repository" (using same structure as maven store it usually)

Notes:

• You can't really browse through the maven repository with your browser with that servlet, it returns a valid response at the moment.
  
• Additional libraries like maven-sling-plugin and maven-packutil-plugin are also already present so accessing day repo is not required for them anymore.
  
• The "/var/maven/tpl/archiva-parent.pom" includes apache people repository and ibliblio mirror automatically so that other dependencies can be found there, you can customize it if necessary.
  
• You can also get a generated pom file that includes all the existing dependencies so you can easily copy/paste those you need for your maven module if you don't want to use the above parent dependency. For example using the URL: http://localhost:4502/maven/dependencies.
  
• You can use a maven archive as proxy so that if your cq5 instance is not running, it can still serve the files.