Here is a list of open-source security repos. Check with competition organizers whether these repos are allowed: Open-source security repos
We have a Linux hardening script and an SSHD config
We have various Splunk scripts
If you cannot download the Splunk forwarder from the Splunk server, try these links: Splunk Forwarder Download Links
Lastly, we have a Windows hardening script and other Windows resources including various other Windows hardening scripts