I reviewed the KartOO metacrawler. Here’s the deal:

Databases: uses several such as altavista, yahoo, and conversa2.
Strengths: you have to see it to believe it!! This is a very visual tool – it shows a web of interrelatedness for your results. The search engine takes your query and almost compartmentalizes all of the information into relevant packages. The information is presented in a map format with arrows showing the relatedness. The results are very narrow – you don’t have to plow through a lot of hits like you get on Google. When you conduct a search, relevant terms are displayed on the left side of the screen, which should be helpful for the beginner researcher who may be unfamiliar with a topic.
Weaknesses: not broad enough for the beginning researcher; selects the most relevant links for you.
Default operation: the more specific you are with your search, the fewer results you get.
Boolean searching: uses this method with terms like “and,” “or,” and “like.”
Truncation: occurs if you use quotation marks for exact search phrases.

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