Clusty

http://clusty.com/

The specially-developed Vivísimo clustering algorithm puts search results together (clusters them) based on textual and linguistic similarity. This raw similarity is augmented with heuristics (i.e., human knowledge) – coded by Vivísimo’s programmers and partly invented by them – based on what users wish to see when they examine clustered documents. The clusters are shown to users in the style of folders and sub-folders.

Vivísimo’s Clustering Engine lets you see deeper and farther with less effort into a large number of search results to:

• Get a quick overview of the main themes that relate to the query.
• See similar results grouped together for faster access.
• Find results that are buried in the ranked list and would otherwise be missed.
• Discover unexpected results and relationships between items.