SharePoint 2010 Forms Authentication with Sql

https://blogs.technet.com/b/mahesm/archive/2010/04/07/configure-forms-based-authentication-fba-with-sharepoint-2010.aspx

https://cks.codeplex.com/releases/view/7450

Federated Search

https://manish-sharepoint.blogspot.com/2009/12/federated-search-in-sharepoint-2010.html

https://manish-sharepoint.blogspot.com/2009/12/federated-search-in-sharepoint-2010_21.html

https://blogs.technet.com/b/vedant/archive/2010/10/27/federated-search-connectors-for-enterprise-search.aspx