Managing multiple RDP and SSH sessions

Sorted alphabetically. All of these except for Remmina are Windows apps.  Some are x-platform.

ASG Remote Desktop

ASG Remote Desktop is a commercial product for managing your many RDP and SSH sessions.

Devolutions

Devolutions RDM product is a free/commercial product for managing your many RDP and SSH sessions.

MobaXTerm

MobaXTerm has a free and paid version of its product.  It allows you to manage multiple types of sessions, manage credentials, and has a bunch of other utilities built in too.  Free XServer, tabbed SSH, tabbed RDP, etc. It is my default remote session application.  What I don't like: It doesn't address multi-display RDP sessions.  Otherwise I keep discovering more features as I use it, and highly recommend it.

mRemoteNG

mRemoteNG is an open source project that also allows you to organize, group, etc. your RDP sessions but it has the added capability of doing this with other kinds of remote sessions, like SSH.

RDCMan

Microsoft 's RDCMan is a free tool, part of Sysinternals, for managing multiple RDP sessions (only RDP, no SSH, etc.).  It allows you to organize them by groups, dynamic groups, save credentials to be used for different sessions, and more. What I don't like: It doesn't support using the Windows key in remote sessions.  I use Win+R all the time for example, so I don't use this application, even though it has a lot going for it.

Remmina

Remmina is an open-source project for multi-session (RDP, SSH, more - plugins make it extensible) management.  It does not run on Windows.

RoyalTS

RoyalTS is another commercial product for managing your many RDP and SSH sessions.

SecureCRT

Vandyke's SecureCRT is another commercial product for managing your many RDP and SSH sessions.