Different types of search engines

Popular search engines

Aesop Search - The Aesop spider looks for new meta tag to allow webmasters to automatically describe their site.
AltaVista - The default search results consist of GoTo and results from the Altavista spider (over 500M pages). Displays related searches. Offers translation services and multimedia searches.
Ask Jeeves - The polite butler Jeeves answers all your questions asked in plain English. If Jeeves doesn't understand your question, it gives you the top-results from other search engines.
Brand New Sites - Directory of just born sites (less than 6 months old) classified in 284 categories.
Direct Hit - Search engine which ranks its search results based on user popularity. Often provides good results for popular queries.
Entireweb.com - Search engine claiming over 80M documents.
Excite - Matching content from the Overture website is displayed first. After that come the search results from the Dogpile and directory results from ODP.
Fast Search - Search with a clear interface through a database of over 300 million web pages. Also offers FTP and MP3 search.
First-Search.com - Returns only the homepage of sites. Targeted at users who are searching for good sites, rather than particular pages.
Google! - Lists the results in the order of popularity, determined by the number of links from other sites. Frequently gives you right results first. All pages in the Google index are cached, and you can search for pages related to a specific page.
HotBot - An advanced search engine. There are many configurable options, both in simple as in advanced search mode.
ILor search - Allows users to create annotated comments on top of search results
Lycos - Displays matches from sites part of the Lycos Network and very popular sites first. Then follow Open Directory results, sometimes followed by results from the Lycos crawler. On the bottom there are links to relevant news articles and products to buy.
Northern Light - A search engine for professional web users. They have a general search engine, and a "Special Collection" of 4M journals/books/mags which are accessable on a pay-per-view basis.
PageSeeker - Search engine with an interactive interface. [Requires Flash]
Raging Search - No-nonsense search engine from Altavista. It even returns the same search results as Altavista. There are no banners or any other content that would distract you from your mission.
7Search.com - Search results include web site information, such as email addresses, location, age and site popularity. (when available). You can choose to be notified when there are sites matching your criteria added to their database.
SearchHippo - A crisp and clean spider based web search with free PHP, XSLT and XML code for integration.
SearchKing - Search engine using searchers input to determine relevancy and placement and has instant indexing.
Teoma Search - Searches deliver pages grouped by subject and as a listing, seaches can be modified to search for an exact phrase and to include and exclude specific terms.
TrueSearch - Search engine actively removes dead links.
WebCrawler - Search engine and web directory. Displays matching categories first. After that come the results from the WebCraweler spider, without descriptions.
WISEnut - Up-to-date index on almost 1.5 billion pages, including site categorization and international search support.
Yep - A portal and search engine that ranks sites by popularity.
Zerx - You can view sites related to another site, or refine your existing search using that site.