Launched in 1994, Yahoo is the web's oldest "directory," a place where human editors organize web sites into categories. However, in October 2002, Yahoo made a giant shift to crawler-based listings for its main results. These came from Google until February 2004. Now, Yahoo uses its own search technology

AltaVista opened in December 1995 and for several years was the "Google" of its day, in terms of providing relevant results and having a loyal group of users that loved the service. Sadly, an attempt to turn AltaVista into a portal site in 1998 saw the company lose track of the importance of search. Over time, relevancy dropped, as did the freshness of AltaVista's listings and the crawler's coverage of the web. Today, AltaVista is once again focused on search Results , and tabs above the search box let you go beyond web search to find images, MP3/Audio, Video, human category listings and news results. AltaVista is worth considering

Formerly one of Search Engine Watch's top choices, MSN Search is definitely one to watch. The service was previously powered by LookSmart results and gained top marks for having its own team of editors that monitored the most popular searches being performed to hand-pick sites believed to be the most relevant. The system worked well.

Ask Jeeves initially gained fame in 1998 and 1999 as being the "natural language" search engine that let you search by asking questions and responded with what seemed to be the right answer to everything

Powered by Yahoo, you may find AllTheWeb a lighter, more customizable and pleasant "pure search" experience than you get at Yahoo itself. The focus is on web search, but news, picture, video, MP3 and FTP search are also offered

AOL Search provides users with editorial listings. The "internal" version of AOL Search provides links to content only available within the AOL online service. In this way, you can search AOL and the entire web at the same time

HotBot's "choose a search engine" interface was introduced in December 2002. However, HotBot has a long history as a search brand before this date

Teoma is a crawler-based search engine owned by Ask Jeeves. It has a smaller index of the web than its rival crawler-competitors Google and Yahoo. However, being large doesn't make much of a difference when it comes to popular queries, and Teoma's won praise for its relevancy since it appeared in 2000. Some people also like its "Refine" feature, which offers suggested topics to explore after you do a search. The "Resources" section of results is also unique, pointing users to page that specifically serve as link resources about various topics. Teoma was purchased by Ask Jeeves in September 2001 and also provides some results to that web site

Lycos is one of the oldest search engines on the web, launched in 1994. It ceased crawling the web for its own listings in April 1999 and instead provides access to human-powered results from LookSmart for popular queries and crawler-based results from Yahoo for others

The Open Directory uses volunteer editors to catalog the web. Formerly known as NewHoo, it was launched in June 1998. It was acquired by AOL Time Warner-owned Netscape in November 1998, and the company pledged that anyone would be able to use information from the directory through an open license arrangement

LookSmart is primarily a human-compiled directory of web sites. It gathers its listings in two ways. Commercial sites pay to be listed in its commercial categories, making the service very much like an electronic "Yellow Pages." However, volunteer editors at the LookSmart-owned Zeal directory also catalog sites into non-commercial categories for free. Though Zeal is a separate web site, its listings are integrated into LookSmart's results.

Compared to Google, Yahoo or even Teoma, Gigablast has a tiny index of the web. However, the service is constantly gaining new and interesting features

Inktomi is an important crawler-based search engine because it provides "backup" results to the popular MSN Search. It was also recently purchased by Yahoo and now providing results to Yahoo