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Semantic search technology is based on a computerized system that understands content and query similar to how the human brain processes natural languages. Instead of matching the occurrence of words or symbols (as done in indexing systems), semantic search systems match concepts and their meaningful variations.

"Indexing 665,737 open source projects"

OCW Search is a search engine dedicated to helping you find the best free university courses online. Several universities publish their course materials for free online, under the OpenCourseWare (OCW) initiative. OCW Search is an independent search engine that indexes all these courses so you can find these courses faster.

This is isoHunt, the most advanced BitTorrent search engine. With cross-referenced trackers statistics for all torrents indexed updated to the hour, this is the best P2P files search engine and community. Try searching in the box above, or browse around our Torrents directory and Zeitgeist for what's new and popular.

See what's trending on Facebook - right now. Indexing 500mm+ people 

Mp3Realm is a vertical search engine that focuses on the mp3 audio format. Mp3Realm also indexes the web for song lyrics.

ClipBlast! is the Internet's fastest growing Web-Wide Video Index, Search and Navigation Platform. Our patent-pending technologies have been designed to organize and simplify the "Video Web"; the fastest growing video distribution platform in history. ClipBlast! technology helps Viewers search, navigate, watch and personalize their experience with the Video Web, and helps Video Content Providers, Advertisers and Marketers monetize their investments.

At Yoople! Project we believe that Web Searches are quite good, but not as smart as a human brain could do. As today we are forced to accept the order given by search engines and click the results as they are, unfortunately this does not mean the human searcher agrees with the returned results index.

is the most comprehensive scientific research tool on the web. With over 410 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.

This server provides bibliographic information on major computer science journals and proceedings. DBLP indexes more than one million articles and contains more than 10000 links to home pages of computer scientists.

Mp3Raid.com is dedicated to index and organize music that has been legally posted on the Internet. We have access to more than a million free mp3 downloads and free music downloads all over the internet which makes us one of the best music search engine on the net. You can legally listen to any mp3 file before you download it and you can post your mp3 on your page/profile for free.

IRC (Internet Relay Chat) remains one of the most active platforms for sharing knowledge and collaborating on the Internet. www.IRSeek.com (still in Beta) strives to make this hidden gem available to the entire Internet community. By constantly archiving active, highly-focused, public chat-rooms in a wide variety of topics then indexing, processing and publishing the content on the web using advanced Web 2.0 technologies while maintaining the privacy of the users, we are creating a knowledge base different from any other.

novoseek is a biomedical search engine developed by bioalma for searching published knowledge in biomedical literature.novoseek indexes biomedical literature from Pubmed, Free Full Text Publications from Open Access Journals in PubMedCentral and US grants from over 75 institutions including the U.S. National Institute of Health (NIH), National Science Foundation, U.S. Department of Agriculture, and Center for Disease Control and Prevention (CDCP) using a text mining technology that enables the identification of key biomedical terms. To perform this ambiguous identification, our technology takes into account external available data as well as contextual term information.

This server provides bibliographic information on major computer science journals and proceedings. DBLP indexes more than one million articles and contains more than 10000 links to home pages of computer scientists.

Decentralizing Twitter, One Tweet at a Time
You can browse and search the tweets already stored in the Twebz database, but in order for any of the "load more tweets from Twitter" options to work, you'll need to sign in. Search:

The ScrapeTorrent torrent search engine collects torrent search results from all of the biggest torrent indexes across the web to make finding the desired content as fast as possible by giving you the largest number of search results possible. Finding the exact torrent is easy, too With a handful of filtering and sorting options to choose from. Viewing and comparing torrent details is easy with the drop-down torrent preview feature and clean and easy to read interface.

Grub Next Generation is distributed web crawling system (clients/servers) which helps to build and maintain free (as in freedom) index of the Web.

SlideFinder is a search engine much like Google and Bing for example. It is specialized towards Microsoft PowerPoint presentations and only indexes presentation.

is the most comprehensive scientific research tool on the web. With over 410 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.

More than 4.500.000 ebooks indexed!