DJ-Canonical (beta) - the new free Joomla plugin was released. This plugin will help you with SEO. It's purposed for websites with multiple URLs (addresses). The canonical link will inform the search engine which URL is preferred and which one should be indexed....

PrestaShop 301 Redirect Module is very handy tool to redirect the URLs by any type of redirection. It allows temporary and permanent redirections e.g. 301 and 302 that are mostly used in the store establishment process. Sometimes, you have to do maintenance on your store so It is better to temporary redirect the address to some other store by 302. In this way, users will not be irritated by all the process. In the other case, if you don’t like your current domain name, you can change it to some other and also you have no worry to lose your SEO...