# CrunchBase: The crunch base provides free information on tech companies, people and their investors, which anyone can accessible easily. It is operated by a news website ‘Tech crunch’ that provides information on IT companies. The CrunchBase claims to have more than 50, 000 contributors and has close to 2 million users accessing the information on the website every month.

# Wolfram Alpha: Released on 15 May 2009, Wolfram Alpha search engine is computational platform or toolkit that encompasses computer algebra, symbolic and numerical computation, visualization, and statistics capabilities. Wolfram Alpha, the answer engine developed by Wolfram Research, is an online service that answers factual queries directly by computing the answer from externally sourced "curated data", than providing a list web pages that might contain the answer like a search engine does.

# Blekko: Launched to the public on 1 November 2010, Blekko uses ‘slashtags’ to provide results for common searches. It allows you to create slashtags after sign up for a custom-sorted search and reduced spam. Offering a downloadable search bar, Blekko search engine provides better search results than those offered by other searches, like Google Search. Blekko gathers results from a set of 3 billion trusted web pages and excluded from such sites as content farms.

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