mRemoteNG is the only connection manager that I liked well enough to move away from SecureCRT, which I've used for well over 10 years. The additions of RDP and VNC, along with tabbed connections, made it an easy switch.
+1 for mRemoteNG. It's by far the best of all I've tried.
Well, if we're counting votes, you can have one from me too mRemoteNG's tabbed interface and supported protocols really helps with remote/local support