Below is a list of vertical (focused, topical) web crawlers that we know about – please let us know of any that we missed:

Commercial

• Panscient – http://www.panscient.com/index.htm
• Hyperix – http://hyperix.com/
• Knowlesys – http://www.knowlesys.com/

Research

• Nalanda – http://ivia.ucr.edu/projects/Nalanda/
• Bingo! – http://www.mpi-inf.mpg.de/departments/d5/software/bingo/index.html

Open Source

• Combine – http://combine.it.lth.se/
• METIS – http://ontoware.org/projects/metis/