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"PDF books search engine" is a PDF finder, document search engine and text search engine on which you can find lots of PDF,ebooks,docs online and text documents.The results given by doc search engine is totally different from the normal search results that you can find on Google because it gives so many results at the same time ,So, may be you will get confused by looking that,that's why ebook search engine comes into picture,It searches the whole web for the PDF and gives back only PDF results.

Looking for cool people or brands on Twitter? Type in a word or phrase and find anyone who mentions it in their bio.

craiggers understands the local/social component of Craigslist, but we also think there are cases when searching outside your immediate community benefits both seekers and providers.

Changing the way you search, remember and manage your information from anywhere on the web.

Why bother with this doorstop? If they wanted real suggestions, they would have given us a little more meat - a little less smoke. This looks like a cheap way to collect e-mail addresses - Spam anyone?.

OK - I noticed the blog link, but I still wonder "Where's the beef!" Most people are even more easily bored than I and will probably give up sooner. Which is what I'm doing now - Bye.

At Helium, we believe that everyone can contribute what they know to share with millions of readers around the globe. At Helium, we believe readers want a choice of viewpoints - not just one opinion on any subject. At Helium, we believe publishers need an easier, more efficient way to get the content they need.

We're building the ultimate database of sampled music, remixes and cover songs Dig deeper into music by discovering direct links among over 112,000 songs and 43,000 artists, from Hip-Hop and R&B via Electronic Music through to Rock, Pop, Funk, Soul, Jazz and beyond. Watch the videos, contribute new content, discuss and vote.

When companies search for you, what do they find? Identified makes the connections in the professional world more accessible, meaningful, and relevant. What Facebook has built for the social graph, Identified is building for the professional graph. Our powerful search engine organizes and categorizes all professional information inside the largest database of people worldwide, Facebook. We help people cultivate their own unique professional brand from their education, work experience, and network.

As the first online Regular Expression tester to offer realtime highlighting and offering more languages than any other online tester, ReJAx continues to be the coolest and easiest to use Regular Expression tester on the web. Supported languages:
    * JavaScript
    * PHP 5 PCRE
    * PHP 5 POSIX
    * Ruby - BETA!!
    * PERL 5
    * UNIX Shell Pattern
It is not necessary to enter the beginning and ending slashes in the pattern field. Not all modifiers will be compatible with every language. Backreferences (when available) are usually in the form of \n where n is the reference number

"Semantic Scholar is a free, nonprofit, academic search engine from AI2."

"store, share, discover research - get more citations for all of the outputs of your academic research over 5000 citations of figshare content to date"