WinSCP for Ubuntu?

[Donkey Hottie]

I found PuTTY, which was great. I can use my Putty keys to open a
connection in Linux too now.

But how about WinSCP? I need SFTP client which can use PuTTY key files
for authentication. I tried FileZilla, but apparently it can't do it. It
just asks for a password, not possibility for SSH private key.

Is there such SFTP app for me?

-- 

All the troubles you have will pass away very quickly.