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Very simple to use. Cons: Not designed for security or investigative data; lacks SNA metrics; limited data import.

is widely considered the best free, open-source alternative for complex network visualization. It excels in handling large datasets (up to 100,000 nodes) and provides advanced metrics like centrality and community detection. i2 analyst notebook free alternative

As you link notes together, it builds a real-time, interactive link analysis map (Graph View). Very simple to use