Keeper

Keeper is a very useful tool that protects all your accounts for email, social networks, forums, and other websites by keeping the corresponding passwords (which should always be different from one another) safe.

With this application, you can organize and store all your passwords in one place. Just create a password for the application itself (which also includes security questions and various recovery methods, just in case) to protect the password database.

You can also use Keeper to automatically generate strong random passwords. There's also a button to automatically copy information to the clipboard. The easiest way to use it, though, is to link your accounts and passwords directly to the application.

With the paid version, you can sync all your content to your mobile devices. That way, you can always have your passwords on hand. Keeper is one of the most effective ways to manage all your passwords and usernames.