Comment (by Roland Haas):

http://www.cactuscode.org moved to github pages in 2020 (see https://github.com/EinsteinToolkit/www.cactuscode.org/issues/19).

Git hash e825525d "Cactus: remove link to removed wavetoy demo server" of cactus removes the now dead link.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2387/move-cactuscodeorg-to-be-hosted-by-github