KeePass is used to store all your passwords in a centralized location using a single master password. It’s a reputed password manager that ensure your passwords are safe and secure and stored in an encrypted format.
Lastpass is used to store all your passwords in a centralized location in Cloud. This is available as free with limited options but it will be sufficient for individuals.
It is used to check the strength of a password with hints about the issues in the password. Some of the password checkers are Kaspersky secure password check.