Online Search Properties

General

• Alexa Internet
• Ask.com (formerly Ask Jeeves)
• Baidu (Chinese)
• Bing 
• Cuil
• Exalead (French)
• Google
• Sogou (Chinese)
• Sohu (Chinese)
• Wikia Search
• Yahoo! Search

Accountancy

• IFACnet

Business

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

Enterprise

• AskMeNow: S3 - Semantic Search Solution
• Concept Searching Limited: concept search products
• 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
• ISYS Search Software: ISYS:web, ISYS:sdk
• 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

Search Appliances

• Google: Google Search Appliance

Multimedia

• blinkx
• FindSounds
• Google Video
• Picsearch
• Podscope
• SeeqPod
• Veveo
• YouTube
• Pixsta
• Munax PlayAudioVideo
• Yahoo! Video

Source code

• Google Code Search
• JExamples
• Koders
• Krugle