SSH Secure Shell
Table of Contents
Windows (Putty)
putty.exe from Putty-CAC, an improved version of Putty-SC adds PKCS#11 support to putty, which the upstream version does not have. It works flawlessly with OpenSC PKCS#11 module. Using the pageant.exe from Putty-CAC allows to use WinSCP with smart cards as well.
Linux / Mac OS X (OpenSSH)
See wiki:OpenSSH for more information.
PuttyCard (deprecated)
PuTTYcard is another, independent implementation to add smart card support to putty. Read more about it here, and download the files from opensc-project.org contrib directory.