WhipPass

WhipPass takes the combination of a website address and a master password (whip) and uses a hashing algorithm to produce secure passwords that are unique to the website you’re logging into.

You only need to remember a single master password, your whip. Combining your whip with the URL of the site you want to access produces a unique, secure and consistently repeatable password for that site.

The hashing algorithm is implemented in JavaScript and executed on the client-side, so your whip is not saved or even transmitted over the internet.