Arcade Analytics is described as 'Graph Visualization tool'. There are three alternatives to Arcade Analytics, not only websites but also apps for a variety of platforms, including Linux, Mac, Windows and Android. The best alternative is Gephi, which is both free and Open Source. Other great sites and apps similar to Arcade Analytics are Linkurious (Paid) and KeyLines Graph Visualization Toolkit (Paid).
Linkurious provides a graph visualization and analysis platform used for fraud detection, anti-money laundering, intelligence or cybersecurity. Easy to deploy and highly extensible, Linkurious Enterprise makes it easy to uncover insights hidden in complex connected data.