In early 2020, Microsoft removed the standalone download of RDCMan from the Download Center due to a security vulnerability (specifically regarding how it parsed .rdg files if modified by a malicious actor). For a time, the link was dead.
Remote Desktop Connection Manager (RDCMan) 2012 is a free Microsoft tool for managing multiple Remote Desktop (RDP) sessions from a single interface. It’s useful for system administrators and power users who connect to many servers or virtual machines and want organized grouping, saved credentials, and quick switching between sessions. remote desktop connection manager 2012 link