Social network analysis, Link analysis and Visualization

• Analyst's Notebook, i2 Inc. software conducts sophisticated link analysis, timeline analysis and data visualization for complex investigations.
• Centrifuge, offers analysts and investigators an integrated suite of capabilities that can help them rapidly understand and glean insight from new data sources.
• Clementine, SPSS data mining suite, includes link visualization software.
• i2 Analyst's Workstation, i2 Inc. software for volume incident analysis; used worldwide to support intelligence-led policing, COMSTAT processes, anti-terrorism/force protection and more.
• InFlow, software for social network analysis & organizational network Analysis.
• LPA Data Mining tools let you build Link Analysis based applications like InFlow.
• Maltego, an open source intelligence and forensics application; allows you to identify key relationships and networks. Community Edition available
• marketVisual, online visual relationship mapping.
• NETMAP analytics, innovative combination of link analysis and data visualization, with applications to fraud detection and claims analysis.
• NetMiner, for Exploratory Analysis and Visualization of Network Data.
• Networked Insights: at the intersection of social networking, collective intelligence, and search, Networked Insights discovers customers' needs as they happen.
• PolyAnalyst, includes software for link analysis and visualization.
• Sentinel Visualizer, with the capabilities of advanced Social Network Analysis, providing the ability to see and analyze complex relationships that exist within data.
• Svivot, offers fraud-detection solution based on analysis of networks of people and organizations.
• VisuaLinks(TM) suite, link analysis and data visualization tool

Free and Open-source Social Network Analysis Software

• Graphviz, open source graph visualization software.
• Maltego Community Edition, an open source intelligence and forensics application; allows you to identify key relationships and networks. Commercial edition available.
• Network Workbench: a large-scale network analysis, modeling and visualization toolkit for biomedical, social science and physics Research.
• Subdue, graph-based knowledge discovery system that finds structural, relational patterns in data representing entities and relationships.
• sna: R Tools for Social Network Analysis, including node and graph-level indices, structural distance and covariance methods, structural equivalence detection, and more.