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LastPass is a freemium cloud-based password management service.
Works on Windows/OSX/Linux, Android/iOS/WP/BlackBerry, Chrome/Firefox/Opera/Safari/IE.
SpecsUpdate
Pros
Pro Allows downloading an encrypted database backup that can only be decrypted with LastPass Pocket
LastPass Pocket is a standalone personal database decrypter. It's a portable executable, meaning it does not need to be installed, that is used to decrypt a local encrypted copy of the password database.
Pro Offers multiple export options
LastPass can dump the whole database as a .csv file or an encrypted file that can then be decrypted using LastPass Pocket as well as separately export Wi-Fi passwords and autofill information. Additional export options are available on a per-browser basis.
Pro Works with portable versions of Chrome and Firefox
Firefox 2+ on Windows, Mac & Linux as well as Chrome 4+ on Windows and Linux support a portable version of LastPass. Great for securely accessing LastPass Vault from public or untrusted computers.
Pro Seamless autofill and password generator via plugins for all popular browsers
All common browsers, including Opera, have plugins that allow automatically filling in forms and generating passwords. All form fill information syncs across all platforms, devices and browsers. Password generator can be adjusted to use or exclude certain characters and patterns.
Pro Multifactor authentication
LastPass offers multiple multifactor authentication options, including Google Authenticator, Grid Multifactor Authentication, Microsoft Authenticator App, Toopher Authentication, Duo Security Authentication, Transakt Authentication, Sesame Multifactor Authentication, Smart Card Authentication and Yubikey Multifactor Authentication.