Bug Me Not

You have an immediate need to do an action on the website, but you'd rather not sign up for fear of receiving unwanted communications. If the bugmenot community shared, you could easily get the login id and password for almost any website. Use a temporary email address while signing up (10minutemail.com, for example) to avoid having spam sent to your primary address. Bug Me not also has a bookmarklet you can use.

Website: https://bugmenot.com/