Comment by xenophonf

You can do all that stuff using Cygwin at least as far back as 2005, because I was running Unix dump and rsync through ssh from a Windows backup server back then. Cygwin eventually adapted PuTTY as its terminal emulator too, in the form of MinTTY.

You can do SSH proxying with PuTTY, too. It's just called something different:

https://stackoverflow.com/questions/28926612/putty-configura...

Plus PuTTY has a command line interface and everything. You can do all the things you mention with PuTTY from a cmd.exe or PowerShell prompt.