These sites do not crawl the web themselves to build an index. Instead they allow searches to be sent to several search engines all at once. The results are then unified. They may either present results from each engine one after the other (parallel search), or blend them, removing duplicates.
Sub Categories
Related Categories
Ranked Sites

Displays results in chart or classic list form. Options include different language interfaces and basic or expert version.
8
85,743
3,252
3,300,000
17,400
NA

Queries multiple search engines simultaneously with the same or different words. Options include serving results separately, interleaved or combined in alphabetical order.
4
1,030,112
NA
83,900,000
1,090
377

Options include choice between top and all engines, sorting by relevance, source, or title.
5
1,248,150
NA
1,580,000,000
12
402

Offers metasearch of the world or the Russian Web, FTP, and multi-media.

Searches the web, MP3s, pictures and news archives via regular, Boolean and natural language. Finds sites rated best by multiple engines for your query.

Queries major search engines and serves the results in a sequence of 10 per source in the default setting. Advanced options include combined results and choice of engine.
4
435,702
NA
1,810,000
118
959

Search tool with a side bar that categorizes subjects within the results. Provides choice of channels including news, reference and business.

Searches several popular search engines simultaneously or individually. Results are collated and ranked for relevancy with redundancies removed, includes filtered, Boolean and advanced options.

Searches over dozen search engines, auctions, jobs, MP3, the bible, forums, news, and stock quotes.

Employs an intelligent technology to find relevant search results from hundreds of search engines and directories. Allows advanced search commands. Several languages and country-specific searches.
6
586,818
NA
922,000
4,760
393