Gimme a Sesame !
This website helps you to generate a passphrase or long password by simulating dices rolls for Diceware method.
Diceware consists to roll dices to determine a word ID in a database called "Diceware Word List".
Then you'll be able to associate some words with no link between them to create a passphrase, hard to find and easy to remember.
Why "Gimme a Sesame" ? Well, as said on Wikipedia,"Open sesame" (French: "Sésame, ouvre-toi"; Arabic: افتح يا سمسم) is a magical phrase in the story of "Ali Baba and the Forty Thieves" in Antoine Galland's version of One Thousand and One Nights. It opens the mouth of a cave in which forty thieves have hidden a treasure. So it's a well known password all across the world.