Powerful Metasearch with simultaneous image search.

Search.com is a great metasearch engine that queries the web from a variety of sources. Positives: speed, relevance. Negatives: design.

Google is a search engine owned by Google, Inc. whose mission statement is to, "organize the world's information and make it universally accessible and useful." The largest search engine on the web, Google receives over 200 million queries each day through its various services.

In addition to its tool for searching webpages, Google also provides services for searching images, Usenet newsgroups, news websites, videos, searching by locality, maps, and items for sale online. In 2006, Google has indexed over 25 billion web pages, 1.3 billion images, and over one billion Usenet messages — in total, approximately 12 billion items. It also caches much of the content that it indexes. Google operates other tools and services including Google News, Google Suggest, Froogle, and Google Desktop Search.

Yahoo! Search is a web search engine, owned by Yahoo!. Originally, "Yahoo! Search" merely referred to an interface, Yahoo! provided, which would pass on queries to another search engine "behind the scenes" (most recently Google), and display them to the user, under the Yahoo! brand. Originally, none of the actual web crawling and storage/retrieval of data was done by Yahoo! itself.

Seeking to provide its own search engine results, Yahoo! acquired other companies with their own search engines. In 2002, it bought Inktomi, a "behind the scenes" search engine, whose results are shown on other companies' web sites. In 2003, it bought Overture Services, Inc., which owned the AlltheWeb and AltaVista search engines. Initially, even though it owned multiple search engines, it didn't use them on the main Yahoo.com web site, but kept using Google's search engine for its results.

However, starting in 2004, Yahoo! Search became an original web crawler-based search engine, with a reinvented crawler called Yahoo! Slurp. Yahoo! Search combined the capabilities of search engine companies it had acquired, with its existing research, and put them into a single search engine. Its new search engine results were included in all of Yahoo!'s sites that had a web search function. It also started to sell its search engine results to other companies, to show on their web sites. Its relationship with Google was terminated at that time, with the former partners becoming each other's main competitors.

MSN Search is a search engine by Microsoft that comprises of a search engine, index, and crawler. This offers one the ability to search for specific types of information using search tabs that include Web, news, images, music, desktop, local and Microsoft Encarta. MSN Search aims to make its over 2.5 billion worldwide queries each month “more useful by providing consumers with improved access to information and more precise answers to their questions.” A configuration menu is available to change the default search engine in Internet Explorer, but the selection is sometimes criticized as being limited, and a custom URL cannot be entered without installing an add-on.

In the past the service relied on different search engine companies as sources, such as Inktomi. Since then Microsoft upgraded MSN Search to provide its own Microsoft-built search engine results (list of web addresses with samples of content that meet a user's query), the index of which is updated weekly or even daily. The upgrade started as a beta program in November 2004 (based on several years of research), and came out of beta in February 2005. MSN Search's search engine index now includes more than 5 billion documents, 400 million images, and 3 million instant answers. The service has also recently changed its look and started providing its search results to other search engine portals in an effort to better compete in the market.

Dogpile was built to give users the best search results available on the Web. This is accomplished by searching all the most popular engines and retrieving the best combined results.

The inspiration for Dogpile came when its founders noticed that different search engines often return different results for the very same term. The more engines they searched the more results they found.

Following this discovery, the founders set out to create a way to bring the Web's best search engines together in one place to deliver more comprehensive and relevant results.

Kartoo is a meta search engine which presents its results on a map.

Mamma.com is a "smart" metasearch engine — every time you type in a query Mamma simultaneously searches a variety of engines, directories, and deep content sites, properly formats the words and syntax for each, compiles their results in a virtual database, eliminates duplicates, and displays them in a uniform manner according to relevance. It's like using multiple search engines, all at the same time.