spg allows one to have a unique password for every site/program, by remembering only one passphrase. This is done by appending the passphrase to the (unique) sitename, and using the first few characters of the resulting entity's base64 encoded md5. The passphrase is not echoed while it's being entered and the resultant password is copied to the clipboard directly. To no point is the passphrase or the generated password visible. Also, no passwords are stored anywhere, so there's no password file to lose. One can generate the same password on any machine.
Usage :
$ spg www.facebook.com Passphrase: $
The git repository is located at github. A snapshot may be downloaded from there.