Mac OS X's built-in keychain access (Keychain access) allows you to save account names/passwords for your users, as well as password strength tests and strong password auto-generation capabilities to see how to use them:
1. In the application-utility, open keychain Access, select "File-New password" on the menubar, click the "Question mark" button in the bottom right corner, pop up the "Password Assistant" window
2. In the "Password Assistant" can generate various types and quality of the password, in the type can choose "Manual", "Easy to Remember", "Letters and Numbers", "Digital Only", "random", "conform to FIPS-181" Six kinds of password composition mode, and then define the password length, which range from 8 to 30 bits, of course, The higher the number of digits, the higher the password quality (intensity), and the more you can get your strong password in the recommendations.