Spark.Sitecore.Seo (nuget): This library supports a number of regularly-requested SEO features, implemented in Sitecore. Some of these have been implemented elsewhere, but I believe my approach 		is stronger for multi-site, multi-language installations. 		 		Features Included:  		Multi-site 404 page subsystem that returns an actual 404 response code. 		Automatic Robots.txt support - configurable for each Sitecore server in your installation. 		Automatic Sitemap.xml support - fully multi-site capable; can be configured to support a wide array of information architectures. 		Rule-based approach to ensuring that Sitecore Items get the most url-friendly name possible.
Keywords: Sitecore