OSMeta is the easiest way to add metadata to Joomla.
There is a free version of OSMeta that works perfectly with the Joomla core.
We've also released a Pro version of OSMeta with support for K2. This was by the most popular request from current users of OSMeta.
K2 Support
To make thing as easy as possible, you can add K2 data directly from the main OSMeta screen.
You can choose "K2 Item" in the top-right corner. Then all your K2 items will be shown on the main OSMeta screen.
No more keywords
We are improving OSMeta by adding features, but also by removing them. We've just removed the ability to add meta keywords via OSMeta.
Google has said for 5 years now that keywords are not used in web rankings.
Our aim is to make the simplest and most effective metadata extension possible, so keywords had to go. Here's the new OSMeta screen:
Here's Matt Cutts talking in 2009 about the end of keywords: