WPMU DEV Infinite SEO has now been replaced by SmartCrawl. It allows you to add custom descriptions and titles to your posts, pages or custom post types. It auto link keywords to any URL and also generates sitemaps for your website automatically. In addition, it has built-in Moz integration. It provides faster index of your website in search engines by submitting your sitemaps to various search engines.
This is the EXACT same plugin as distributed by the developer on WPMU DEV. The developers’ links are provided above.