CTFd

CTFd, an open-source platform to run capture-the-flag events.

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CTFd is an open-source platform that can be used to run CTF events for free. It offers a user-friendly web interface for both administrators and players, and has a modular system allowing for integrations with other external services. CTFd is very popular among security enthusiasts and has been used to host some of the largest CTF events in the world.

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