Best free tool to manage multiple RDP Connections?

Hey guys, im looking for a free tool to manage my RDP Connections (4-5). Currently I just open they all separately and check them and its a bit annoying. I found out about some tools like RoyalTS, mremoteng or Remote Desktop Manager and wanted to ask what you would suggest for me. In best case it should open all connections with one click, show them all on my screen and would monitor RAM / CPU usage aswell.

Would appreciate any help!