• Combyo
  Combyo combines hot deals & coupons from top deal sites like Fatwallet, Slickdeals etc. and presents them with real-time price comparison side by side. In case you don't have the time to look for deals everyday, tell us what you are looking for and the price you are looking for. We will alert you when there is a price drop.
  in Tools > Shopping with compare metasearch prices shopping tools by 3 users
• iBoogie MetaSearch Engine
  
  iBoogie MetaSearch Engine with automatic document clustering.
  clustering directory document engine information meta retrieval search
  in Tech > Search with metasearch search by 2 users
• Ixquick Metasearch
  in Tech > Search with metasearch search by 20 users
• keotag
  tag search multiple engines and tag generators
  Keotag - tag search multiple engines, tag generator and social bookmark links generator. Buzz Monitoring.
  blog bookmark buzz engine feed google monitoring newsvine search social tag tagger tagging technorati tool weblog website yahoo
  in Tech > Search with blog metasearch search social by 13 users
• MESA: Meta Email Search Agent
  For a given name it searches in parallel at (nearly) all available sources of email addresses on the Internet.
  in Education & Reference > People with email metasearch people search by 8 users

metasearch from all users