Here I list more. I will check them once in a while to make sure they are still available.
- Ask Jeeves
- Best of the Web
- Craigslist is is a text-based classified advertisements website with sections devoted to jobs, housing, personals, for sale, items wanted, services, community, gigs, résumés, and discussion forums.
- Dogpile is a metasearch engine that fetches results from Google and Yahoo search engines.
- Fagan Finder
- KartOO assists users in finding the most appropriate website for a given query without delay.
- Search.com – meta-search search engine
- Torrentz – meta-search search engine
- Yippy is a family friendly web portal and safe search engine for kids. It’s geared towards K-12 users, filtering out explicit and inappropriate material to keep searches clean and informative.
- ZapMeta is a meta-search engine, a search tool that provide users the ability of simultaneously search multiple search engines under one interface.
Deep web search:
- CompletePlanet (BrightPlanet decided to discontinue CompletePlanet in March 2014)
- InfoRapid Search and Replace – searching and previewing HTML, RTF, PDF, WinWord and Excel files and many other file formats. (Not update any more)
- Wolfram|Alpha introduces a fundamentally new way to get knowledge and answers — not by searching the web, but by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods.
- arXiv.org is open to users to access to e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
- CogPrints is an electronic archive for self-archive papers in many areas such as Psychology, Neuroscience, and Linguistics, Computer Science, Philosophy and Biology.
- Crossref is a collaborative reference linking service for people to search online publications based on open-standards technology (the Digital Object Identifier, or DOI, system). Its services include: CrossCheck, CrossMark, Crossref Metadata Services (CMS), Cited-by linking, FundRef, and CrossRef Text and Data Mining.
- DevInfo is a database system endorsed by the United Nations Development Group for monitoring and analysing human development.
- DMOZ is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.
- HighBeam is the premier online research tool for business and academic use. It allows you search more than 80 million articles from the archives of over 6,500 newspapers, magazines, journals, and other publications.
- ImageNet is an ongoing-growth image database organised according to the WordNet hierarchy. This resource was explained by prof Fei Fei Li in a great speech at TEDTalks.
- ingentaconnect is a website that hosts scholarly books and journals from a range of different publishers.
- Internet Documents in Economics Access Service (IDEAS) is a service providing information about working papers and published research to the economics profession. It uses the complete data from the RePEc database, which includes bibliographic data contributed by over 1300 archives, including many of the major research outlets and publishers.
- JournalTOCs makes it easy for academics, researchers, students and anyone else to keep up-to-date with newly published scholarly material by enabling them to find, display, store, combine and reuse thousands of journal tables of contents from multiple publishers.
- OCLC FirstSearch provides seamless electronic access to many databases covering a wide range of topics and formats. The FirstSearch Base Package includes WorldCat as well as other databases such as CAMIO, Electronic Books and OAIster.
- ORCA is a digital repository of research publications from Cardiff University.
- ProQuest is a gateway to the world’s knowledge – from dissertations to governmental and cultural archives to news, in all its forms.
- Questia is the world’s largest online library of books, with over 77,000 full-text books, 4 million articles, and an entire reference set complete with a dictionary, encyclopedia, and thesaurus.
- Scopus is the world’s largest abstract and citation database of peer-reviewed literature and quality web sources.
- The Free Library compiles an enormous amount of published material – journals, magazines, blog postings, and classic literary texts.
- The Web of Knowledge Service for UK Education provides a single route to all the Thomson Reuters products subscribed to by UK institutions.
- The WWW Virtual Library (VL) is the oldest catalog of the Web, started by Tim Berners-Lee, the creator of HTML and of the Web itself, in 1991 at CERN in Geneva. Unlike commercial catalogues, it is run by a loose confederation of volunteers, who compile pages of key links for particular areas in which they are expert; even though it isn’t the biggest index of the Web, the VL pages are widely recognised as being amongst the highest-quality guides to particular sections of the Web.
- Zetoc provides access to the British Library’s Electronic Table of Contents of around 20,000 current journals and around 16,000 conference proceedings published per year. The database covers 1993 to date, and is updated on a daily basis.
- AddALL searches used and out of print books
- Audible.co.uk provides digital audiobooks, including literary classics, new releases & fully unabridged performances.
- JustFreeBooks searches 700 web sites and help you find all sorts of free books.
- Used Book Search
Journals & Articles search:
- AIS eLibrary is a central repository for research papers and journal articles relevant to the information systems academic community.
- BASE is one of the world’s most voluminous search engines especially for academic open access web resources. BASE is operated by Bielefeld University Library.
- JSTOR is a not–for–profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive of over one thousand academic journals and other scholarly content.
- MagPortal provides articles search from many freely accessible magazines.
- ScienceDirect supports books and journal articles search, owned by Elsevier.
- the Directory of Open Access Journals is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact. The Directory aims to be comprehensive and cover all open access scientific and scholarly journals that use a quality control system to guarantee the content.
- The UK Student Academic Directory presents a Knowledgebase of articles which was developed specifically for STUDENTS.
Multiple Language literature search:
- The LiTgloss is a collection of texts written in languages other than English. The texts are of literary, cultural, or historical interest to speakers of English, and likely to be better appreciated if read in the original language.
Dissertations & Theses search:
- eThOS – British Library electronic theses online service
- DART-Europe E-theses Portal
- Index to Theses
- Links to E-theses for Researchers provided by London Metropolitan University
- COMS Conference directory
- Conference Alerts brings together two groups of people – conference organizers, and academics who need to stay informed about conferences.
- IEEE Conferences and Events search
Blogs & posts search:
- Meltwater IceRocket
- A list of blog search engines provided by Ari Paparo
- findcourses.co.uk – professional training courses search engine
- FindAMasters is a one-stop shop for students looking for a postgraduate Masters course/ qualification within the UK.
- Hotcourses – search UK courses
- London University Courses – search courses in London’s universities and colleges
- National Careers Service
- UCAS – search UK courses
- unistats – the official site for comparing UK Higher Education course data
Dictionary – vocabulary search:
- Cambridge Dictionary Online
- Chambers (UK) – Free English Dictionary
- Collins English Dictionary
- Dictionary.com is an Ask.com service.
- Merriam-Webster Online – Dictionary and Thesaurus
- OneLook Dictioanry Search
- Oxford Dictionaries
- The Free Dictionary by Farlex
- The Longman Dictionary of Contemporary English Online is an online version of the CD-ROM of the Longman Dictionary of Contemporary English, Updated Edition.
- The Visual Thesaurus is an interactive dictionary and thesaurus that allows you to discover the connections between words in a visually captivating display.
- Welsh-English / English-Welsh On-line Dictionary at the University of Wales Trinity Saint David
- William Whitaker’s Words provides Lartin and English translation. It contains about 39,000 entries.
- Wiktionary is a free dictionary with English definitions from over 400 languages.
- Wordnik is based on the principle that people learn words best by seeing them in context. They’ve collected more than 4 billion words of text (web pages, books, magazines, newspapers, etc.) and have mined them exhaustively to show you example sentences for any word you’re interested in.
- WordReference.com is good for you to search the English words for the definitions in multiple languages.
- YourDictionary has a comprehensive library of original articles. Get the answers you need on grammar, language, spelling, ESL, and more.
- MetaGlossary is able to precisely extract the meanings of terms and phrases from the often frustratingly unmanageable mass of information on the web.
Companies & people search:
- 192.com tells you more about people, businesses & places in the UK than any other directory.
- CrunchBase is the free database of technology companies, people, and investors that anyone can edit.
- intelius provides comprehensive email address search for the U.S.
- LinkedIn people search – LinkedIn worldwide network of professionals can be searched.
- NetTrace – be careful of putting your personal information on the web. It is searchable and visible.
- Pipl‘s query-engine helps you find deep web pages that cannot be found on regular search engines.
- Yell allows you find local business.
- ZabaSearch free people search for the U.S.
Other lists of search engines: