Capture The Flags (CTFs) are how the those of us in the computer security industry test both ourselves and each other. This year for CSAW CTF I completely rewrote the website behind the CTF to make it easier for myself and future organizers to administrate.
CTFd has everything you need to run a large scale CTF or a small classroom exercise. CTFs are one of the fastest growing educational mediums and their versatility in both testing and teaching is unmistakable.
Prioritizing ease of deployment, administration, and use, CTFd takes less than 5 minutes to get onto a network and there are very few scenarios in which you have to leave your web browser to manage it.
CTFd development is ongoing, and there are so many more features to add, but I hope that you can make as much use of CTFd as we have.