Meta Gen is small tool that allows webmasters to easily generate the Description and Keyword meta tags and to automatically insert them into selected pages. While this is a great timesaver to insert uniform tags into large numbers of pages, it does not support any of the more advanced meta tags, but is limited to the Keyword and Description tags. You can chose to have the program remove your existing tags before inserting the new ones. The program is furthermore limited to .html and .htm file extensions.
