FileZilla
+1 for WinSCPWinSCP is a great open source client for sftp if you're looking for one.
I use Winscp through sftp. Filezilla has a nasty habit of storing passwords in plaintext which can result in easy hacking.
http://www.wickedfire.com/newbie-qu...ssian-injection-through-filezilla-client.html
10 FTP Clients Malware Steals Credentials From | Unmask Parasites. Blog.