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             The Open Threat Partner eXchange (OpenTPX) consists of an open-source format and tools for exchanging machine-readable threat intelligence and network security operations data. It is a JSON-based format that allows sharing of data between connected systems.
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+            <a href="https://www.passivetotal.org/" target="_blank">PassiveTotal</a>
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+            The PassiveTotal platform offered by RiskIQ is a threat-analysis platform which provides analysts with as much data as possible in order to prevent attacks before they happen. Several types of solutions are offered, as well as integrations (APIs) with other systems.
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             <a href="https://github.com/tripwire/tardis" target="_blank">TARDIS</a>