Largest Subnetwork App is a Cytoscape app. It provides the functionality to select the largest connected subnetwork in the current network.
Cytoscape app store page: https://apps.cytoscape.org/apps/largestsubnetwork
This simple app adds a menu option under Select > Nodes to select the Largest Subnetwork in the current network. This operation is useful when working with a partitioned network consisting of two or more distinctly connected graphs. Partition networks are common following MCL clustering, for example, or from importing interactions from databases like STRING.
The selection operation is supported in automation use cases as well. The basic command syntax is network select subnetwork. You can optionally specify a network with name or SUID with the network parameter. You can optionally create a new subnetwork with the createSubnetwork parameter. You can also optionally select subnetwork with a must-contain node with the includesNode parameter.