We check this website, now filezilla-project.org is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is filezilla-project Down Right Now? - NO! filezilla-project is up!
If you have problem with access to site filezilla-project, and domain filezilla-project.org is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).