[csixty4]

Pagent has become a sort of de-facto standard for ssh agents on Windows. Once I get my Yubikey set up, I can even substitute gpg for Pagent and have it speak the same protocol (it's a setting, off by default).

Git for Windows drops in a command line ssh client pre-configured for Pagent auth, and git itself can pull keys from Pagent as well. I just needed to tweak my path so that ssh client gets used instead of msys2's.

I'm with you. I can't stand the actual PuTTY app itself.