General

• Ask.com
• Baidu (Chinese, Japanese)
• Bing
• Blekko
• Duck Duck Go
• Google
• Kosmix
• Sogou (Chinese)
• Soso.com (Chinese)
• Yahoo!
• Yandex (Russian)
• Yebol
• Yodao (Chinese)

P2P search engines

• FAROO
• YaCy (Free and fully decentralized)

Metasearch engines

• Brainboost
• ChunkIt!
• Clusty
• DeeperWeb
• Dogpile
• Excite
• Harvester42
• HotBot
• Info.com
• Ixquick
• Kayak
• LeapFish
• Mamma
• Metacrawler
• MetaLib
• Mobissimo
• Myriad Search
• SideStep
• Turbo10
• WebCrawler

Collaborative

• SearchTeam

Geographically limited scope

• Accoona, China/United States
• Alleba, Philippines
• Ansearch, Australia/United States/United Kingdom/New Zealand
• Biglobe, Japan
• Daum, Korea
• Goo, Japan
• Guruji.com, India
• Leit.is, Iceland
• Maktoob, Arab World
• Onkosh, Arab World
• Miner.hu, Hungary
• Najdi.si, Slovenia
• Naver, Korea
• Rambler, Russia
• Rediff, India
• SAPO, Portugal/Angola/Cabo Verde/Mozambique
• Search.ch, Switzerland
• Sesam, Norway, Sweden
• Seznam, Czech Republic
• Walla!, Israel
• Yandex, Russia
• Yehey!, Philippines
• ZipLocal, Canada/United States

Accountancy

• IFACnet

Business

• Business.com
• GlobalSpec
• Nexis (Lexis Nexis)
• Thomasnet (United States)
• GenieKnows (United States and Canada)

Enterprise

• AskMeNow: S3 - Semantic Search Solution
• Concept Searching Limited: concept search products
• Coveo: Coveo Enterprise Search platform, Coveo Expresso
• Dieselpoint: Search & Navigation
• dtSearch: dtSearch Engine (SDK), dtSearch Web
• Endeca: Information Access Platform
• Exalead: exalead one:enterprise
• Expert System S.p.A.: Cogito
• Fast Search & Transfer: Enterprise Search Platform (ESP), RetrievalWare (formerly Convera)
• Funnelback: Funnelback Search
• IBM: OmniFind Enterprise Edition
• Inbenta: Inbenta Semantic Search Engine
• ISYS Search Software: ISYS:web, ISYS:sdk
• Jumper 2.0: Universal search powered by Enterprise bookmarking
• Microsoft: SharePoint Search Services
• Northern Light
• Open Text: Hummingbird Search Server, Livelink Search
• Oracle Corporation: Secure Enterprise Search 10g
• SAP: TREX
• TeraText: TeraText Suite
• Vivisimo: Vivisimo Clustering Engine
• X1 Technologies : X1 Enterprise Search
• ZyLAB Technologies: ZyIMAGE Information Access Platform

Food/Recipes

• Yummly: semantic recipe search

Mobile/Handheld

• Taganode Local Search Engine
• Taptu: taptu mobile/social search

Job

• Bixee.com (India)
• CareerBuilder.com (USA)
• Craigslist (by city)
• Dice.com (USA)
• Eluta.ca (Canada)
• Hotjobs.com (USA)
• Incruit (Korea)
• Indeed.com (USA)
• LinkUp.com (USA)
• Monster.com (USA), (India)
• Naukri.com (India)
• Yahoo! HotJobs (Countrywise subdomains, International)

Legal

• WestLaw
• Lexis (Lexis Nexis)
• Quicklaw
• Manupatra

Medical

• Bing Health
• Bioinformatic Harvester
• EB-eye EMBL-EBI's Search engine
• Entrez (includes Pubmed)
• GenieKnows
• GoPubMed (knowledge-based: GO - GeneOntology and MeSH - Medical Subject Headings)
• Healia
• Nextbio (Life Science Search Engine)
• PubGene
• Quertle (Semantic search of the biomedical literature)
• Searchmedica
• VADLO (Life Sciences Search Engine)
• WebMD

News

• Bing News
• Google News
• Daylife
• MagPortal
• Newslookup
• Nexis (Lexis Nexis)
• Topix.net
• Yahoo! News

People

• Comfibook
• Ex.plode.us
• InfoSpace
• PeekYou
• Spock
• Spokeo
• Wink
• Zabasearch.com
• ZoomInfo

Real estate / property

• Fizber.com
• HotPads.com
• Redfin
• Rightmove
• Zillow.com

Television

• TV Genius

Video Games

• Wazap (Japan)

By information type

Search engines dedicated to a specific kind of information

Forum

• Omgili

Blog

• Amatomu
• Bloglines
• BlogScope
• IceRocket
• Technorati

Multimedia

• Bing Videos
• blinkx
• FindSounds
• Google Video
• Munax's PlayAudioVideo
• Picsearch
• Pixsta
• Podscope
• ScienceStage
• Songza
• SeeqPod
• TV Genius
• Veveo
• TinEye
• Yahoo! Video
• YouTube

Source code

• Google Code Search
• JExamples
• Koders
• Krugle

BitTorrent

These search engines work across the BitTorrent protocol.

• Btjunkie
• FlixFlux
• Isohunt
• Mininova
• The Pirate Bay
• TorrentSpy
• Torrentz

Email

• TEK

Maps

• Wiki Mapia
• Bing Maps
• Géoportail
• Google Maps
• MapQuest
• Yahoo! Maps

Price

• Bing Shopping
• Google Product Search (formerly Froogle)
• Kelkoo
• MySimon
• PriceGrabber
• PriceRunner
• PriceSCAN
• Shopping.com
• ShopWiki
• Shopzilla (also operates Bizrate)
• TheFind.com
• Wishabi

Question and answer

Human answers

• Answers.com
• eHow
• Uclue
• Yahoo! Answers
• Stack Overflow/Stack Exchange Network
• DeeperWeb
• Quora

Automatic answers

• AskMeNow
• BrainBoost
• True Knowledge
• Wolfram Alpha

Natural language

• Ask.com
• Bing (Semantic ability is powered by Powerset)
• BrainBoost
• hakia
• Lexxe
• Powerset

By model

Open source search engines

• DataparkSearch
• Egothor
• Grub
• Ht://dig
• Isearch
• Lucene
• Lemur Toolkit & Indri Search Engine
• mnoGoSearch
• Namazu
• Nutch
• OpenFTS
• Sciencenet (for scientific knowledge, based on YaCy technology)
• Sphinx
• SWISH-E
• Terrier Search Engine
• Wikia Search
• Xapian
• YaCy
• Zettair

Semantic browsing engines

• Evri
• Hakia
• Yebol

Social search engines

• ChaCha Search
• Delver
• EarthFrisk.org
• Eurekster
• Mahalo.com
• OneRiot
• Rollyo
• Sproose
• Trexy
• Wikia search
• Wink provides web search by analyzing user contributions such as bookmarks and feedback

Visual search engines

• ChunkIt!
• Grokker
• Pixsta
• PubGene
• Viewzi

Search appliances

• Google: Google Search Appliance

 

Desktop search engines

Name	Platform	Remarks	License
Autonomy	Windows	IDOL Enterprise Desktop Search.	Proprietary, commercial
Beagle	Linux	Open source desktop search tool for Linux based on Lucene	A mix of the X11/MIT License and the Apache License
Copernic Desktop Search	Windows	Considered best overall search engine in 2005 UW benchmark study.[1]	Free for home use
Docco	cross-platform (Java)	Based on Apache's indexing and search engine Lucene, and it requires a Java Runtime Environment.	BSD License [2]
Docfetcher	Cross-platform	Open source desktop search tool for Windows and Linux, based on Apache Lucene	Eclipse Public License
dtSearch Desktop	Windows		Proprietary (30 day trial)
Easyfind	Mac OS		Freeware
Everything	Windows	Find files and folders by name instantly on NTFS volumes	Freeware
Google Desktop	Linux, Mac OS, Windows	Integrates with the main Google search engine page. 5.9 Release now supports x64 systems.	Freeware
GNOME Storage	Linux	Open Source desktop search tool for Unix/Linux	GPL
imgSeek	Linux, Mac OS, Windows	Desktop content-based image search	GPL v2 [3]
InSight Desktop Search	Windows	Metadata-based search utility	Freeware
ISYS Search Software	Windows	ISYS:desktop search software.	Proprietary (14 day trial)
Likasoft Archivarius 3000	Windows	-	Proprietary (30 day trial)
Meta Tracker	Linux, Unix	Open Source desktop search tool for Unix/Linux	GPL v2 [4]
Recoll	Linux, Unix	Open Source desktop search tool for Unix/Linux	GPL [5]
Spotlight	Mac OS	Found in Apple Mac OS X "Tiger" and later OS X releases.	Proprietary
Strigi	Linux, Unix, Solaris, Mac OS X and Windows	Cross-platform open source desktop search engine	LGPL v2 [6]
Terrier Search Engine	Linux, Mac OS, Unix	Desktop search for Windows, Mac OS X (Tiger), Unix/Linux.	MPL
Tropes Zoom	Windows	Semantic Search Engine.	Freeware and commercial
Windows Search	Windows	Part of Windows Vista and later OSs. Available as Windows Desktop Search for Windows XP and Server 2003. Does not support indexing UNC paths on x64 systems.	Proprietary, freeware

Usenet

• Google Groups (formerly Deja News)

Based on

Google

• AOL Search
• CompuServe Search
• Groovle
• MySpace Search
• Netscape
• Ripple

Yahoo!

• AltaVista
• Ecocho
• Everyclick (formerly based on Ask.com)
• Forestle (an ecologically motivated site supporting sustainable rain forests - formerly based on Google)
• GoodSearch
• Rectifi

Bing

• A9.com
• Alexa Internet
• Ciao!
• Facebook
• Tafiti
• Ms. Dewey
• Yahoo! Search

Ask.com

• Hakia (semantic search)
• iWon
• Lycos

Acquired or defunct search engines

• AlltheWeb
• BRS/Search (now OpenText Livelink ECM Discovery Server)
• Cuil
• Direct Hit Technologies (acquired by Ask Jeeves in January, 2000)
• Google Answers
• Infoseek
• Inktomi
• Kartoo
• Lotus Magellan
• Overture.com (formerly GoTo.com, now Yahoo! Search Marketing)
• PubSub
• RetrievalWare (acquired by Fast Search & Transfer and now owned by Microsoft)
• Singingfish
• Sphere
• Tafiti
• Teoma
• Wikia Search
• WiseNut
• World Wide Web Worm