MetaMan is a super cool tool created to assist administrator in moderating site's Meta data along with Facebook's OpenGraph and Twitter Card's tags on the site without hassle. Its also allows you to directly upload images directly to the site without having difficulties figuring out the absolute url to these images. It's like gives you a hawk eye view of the meta on the site while viewing the page directly.
MetaMan is a standalone plugin which works out of box across Joomla! 2.5 and Joomla 3.x. It's doesn't requires any framework to be installed together and it's lightweight.
Just like Joomla, MetaMan runs on PHP. So, it requires PHP to exists on the site.