Browserpass is a browser extension for zx2c4's pass, a UNIX based password store manager. It allows you to auto-fill or copy to clipboard credentials for the current domain, protecting you from phishing attacks.
Buttercup is a beautifully-simple password manager designed to help manage your credentials. Buttercup uses very strong encryption to protect your sensitive details under a single master password - Feel free to use stronger and more complex passwords for each service and let Buttercup store them securely.