Microsoft SharePoint online
SharePoint is a cloud-based service offered from Microsoft that helps organizations share and manage content, knowledge, and applications to empower teamwork, quickly find information and seamlessly collaborate across the organization.
In our research and deployment we have privileged enterprise infrastructure setup of SharePoint online in cloud to host the application that provides single sign on authentication using O365 with directory services, out of the box workflow development for email send and receive and host the database using SharePoint online Document library and SharePoint lists.