This document is a guidebook listing 50 free online tools designed for Security Operations Center (SOC) analysts, categorized into various sectors such as internet scanning engines, vulnerability databases, threat intelligence platforms, and phishing detection. These tools aim to enhance threat detection, analysis, and response efficiency, thereby improving cybersecurity practices. Key resources discussed include Censys, AlienVault OTX, Have I Been Pwned, and various code and cloud storage search tools.