Hey,
For an anticheat, this is one of the best ones that you can get without paying a penny: [RELEASE] Badger-Anticheat (actually works)
Make sure to read the documentation for it though, it is fairly complex and leads to problems if misconfigured.
DDoS-wise, you’d need to install some kind of filtering software to the machine the server is on, I cannot help you on that.
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