More commonly referred to as Agent Ransack, though that is the Lite edition, FileLocator Pro gives fast search facilities over a number of disparate resources.

NB: Agent Ransack (the free edition / FileLocator Lite) does not include the PST search functionality: http://www.mythicsoft.com/filelocatorpro/features

FileLocator Network is an additional product which allows you to distribute search processing across multiple nodes; especially useful when searching on devices distributed across a WAN: http://www.mythicsoft.com/filelocatornetwork