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How to run games on Arch (and configure Steam and Proton)
A list of Free Software network services and web applications which can be hosted on your own servers
A curated list of amazingly awesome open-source sysadmin resources.
The Web Security Testing Guide is a comprehensive Open Source guide to testing the security of web applications and web services.
Small and highly portable detection tests based on MITRE's ATT&CK.
A cheat sheet that contains common enumeration and attack methods for Windows Active Directory.