Yahoo! Search BOSS (Build your Own Search Service) is a Yahoo! Developer Network initiative to provide an open search web services platform.
The main goal and idea of BOSS is to give users, in this case developer’s free access to the Yahoo! Search index. The results can be supplied into the developer’s website or program so that they can manipulate the resources according to their product’s requirements. BOSS allows the results to be returned back in XML, HTML, text and also allows the comprehensive search feature allowed in Yahoo like …

Mahalo.com is a web directory (or human search engine) launched in alpha test in May 2007 by Jason Calacanis. As of January 2008, the project is in beta test. It differentiates itself from algorithmic search engines like Google and Ask.com, as well as other directory sites like DMOZ and Yahoo by tracking and building hand-crafted result sets for many of the currently popular search terms. Mahalo means “thank you” in Hawaiian.
Mahalo’s directory employs human editors to review websites and write search engine results pages that include text listings, as …

Scour Inc. was a multimedia search engine on the internet, and provided Scour Exchange, an early peer-to-peer file exchange service. Scour was founded by five students (Vince Busam, Michael Todd, Dan Rodriques, Jason Droege and Kevin Smilak) from the Computer Science Deptartment of the University of California, Los Angeles (UCLA) in 1997. It moved into the spotlight in 1999 when former Disney president Michael Ovitz bought about a quarter of its shares.

Cuil is a search engine that organizes web pages by content and displays relatively long entries along with thumbnail pictures for many results. It claims to have a larger index than any other search engine, with about 120 billion web pages. It went live on July 28, 2008.
Cuil’s privacy policy, unlike that of other search engines, says it does not store users’ search activity or IP addresses
Cuil is managed and developed largely by former employees of Google: Anna Patterson, Russell Power. The CEO and co-founder, Tom Costello, has worked …

Viewzi is a search engine company based in Dallas, Texas that is developing a highly visual experience that tailors the way users look at information based on what they are looking for. The search engine lightens the data overload by filtering and grouping results into several distinct interfaces. Users get over 16 “views” for their search including MP3 view (with a list of streaming audio you can play), album view (cover art and related musicians), plus specialized lenses for images, news, and more.

LeapFish is a multi-dimensional search aggregator that retrieves results from several of the top search portals, including Google, Yahoo, Live Search, Blogs, Videos, Shopping and other popular search engines. It is a registered trademark of Dotnext Inc..
The search engines obtains its notability by how they display their results. Unlike Dogpile, LeapFish does not combine and reorder search results. It allows the user to set what and who they want to obtain results from. In addition, it displays all related content from the web and positions it to the left …

Boogami is a search engine that was developed by James Wildish, a sixteen year old college student from Kent in United Kingdom. It combines a search engine with a pixel advertising grid that appears every time someone uses Boogami to search the Internet, and for the fact that it offers free pixel advertising to charities.
James approached the Where On Earth Group and internet marketing specialists Divadani for help in launching Boogami and making it a success. As a result, the British media soon picked up on the story and …

Powerset is working on building a search engine that can find targeted answers to user questions (as opposed to keyword based search). For example, when confronted with a question of the form ‘which U.S. state has the highest income tax?’, conventional search engines ignore the question and instead do a search on the keywords ‘state, income and tax’. Powerset’s product, on the other hand, attempts to use natural language processing to understand the nature of the question and then to search and return a subset of the web that …

Google search is a Web search engine owned by Google, Inc., and is the most used search engine on the Web. Google receives several hundred million queries each day through its various services. Google search was originally developed by Larry Page and Sergey Brin in 1997.
PageRank
Google’s algorithm uses a patented system called PageRank to help rank web pages that match a given search string.

Exalead is a French search engine involved in the Quaero project.
Exalead provides thumbnail previews of the target pages along with the results, and allows advanced refining on the results page (language, geographic location, file type, categories) but also further data refinement, such as rich content (audio, video, RSS) and related terms, allowing users to browse the web by serendipity.