RokCommon is a utility plugin that provides the library functions that are required for the RokSprocket and RokGallery extensions.
RokSocialButtons is a basic content plugin to display social links such as Facebook, Google+ and Twitter, with options for manual or category level addition.
RokInjectModule is bundle installed with RokSprocket, but also standalone here. It allows for modules to be injected into content via the [module-#] command.
RokNavMenu Exporter allows you to bring your existing styled Joomla menu over to phpBB for a more seamless experience. It is a great way to keep your visitors engaged with your site in its entirety.