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             The free threat intelligence parsed and aggregated by Critical Stack is ready for use in any Bro production system. You can specify which feeds you trust and want to ingest.
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+            <a href="https://www.c1fapp.com/" target="_blank">C1fApp</a>
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+            C1fApp is a threat feed aggregation application, providing a single feed, both Open Source and private. Provides statistics dashboard, open API for search and is been running for a few years now. Searches are on historical data.
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