Flexible password generator using a cryptographic hash algorithm of your choice - Fully Compatible with PasswordMaker.org
This Chrome Extension implements the PasswordMaker.org method for generating a unique, secure password for any site, from a single master password.
There are apps, extensions, etc. for all the major platforms that implement this same method and are compatible with each other - see the PasswordMaker.org site for the list.
This technique has been widely used since 2003, though it has been eclipsed by generators that create a random password for each site. The problem with that method is that every generated password must be stored - with the PasswordMaker.org method you only need to memorize or record the one master password.
Later, if you switch to a different platform or lose all record of your passwords, you can still easily unlock all your passwords, for all your sites (and on any platform since this same technique is implemented on other platforms) as long as you can remember your master password.
(Note that your master password can not be determined from the generated passwords - that is fundamental to the security of this method.)