UNESCO

UNESCO is an organism of the ONU specializated on the culture. In its website we can find a lot of information about culture, natural sciences, social sciences...

In this website we can find information related to different fields published by this organism, so it is fiable information to take in account to make works or investigations.

www.unesco.com

HotBot

HotBot was created in 1996 as a device of the journal Wired. It is a search engine, and it allowed to hospedate in a free way websites, but for a brevity period of time, without inform to the users.

In 1998, it was bought by Lycos, and then HotBost devices were reduced. Nowadays, it is a simple front for some other search engines like Yahoo! or MSN.

It was one of the first search engines in allow to refine the search.

www.hotbot.com

Google Patents

Google Patents is a tool of Google that allow to access to a database of patents, where it is possbile search for information about patents, like the inventor, the year of invention, the description of the patented product...

https://www.google.es/

ACM Digital Library

It is, like the name indicates, a digital library. It has a huge colection of books with the complet text and bibliograpih references. It is operative since 1950.

In principle it as journal articles, reports, small notices, proceedings and papers.

It allows to create ACM account in order to keep bibliographies and resources of the ACM Digital Libraries.

http://dl.acm.org/

Google Maps

Google Maps is one of the tools of Google. It is useful to search real photograps of the Earth, and in particular of a certain zone. It is helpful to ubicate a country, a city, a street in the world. So if you have to do a search about a determinate place and it is completely unknown for you, you can start by ubicate it on the Earth, it can give you some clues about how the places can be.

https://maps.google.es/maps

Ipselon

Ipselon is a metasearcher, similar to Google.Its results are obtained from Yahoo, Google and MSN, each one with the information of which is its origin.

Ipselon allows us to search images, maps, noticies or even in Wikipedia.

www.ipselon.com

Wolfram Alpha

Wolfram Alpha is a searcher of answers, not a search engine, developed by Wolfram Research.

This device answers directly the questions made, extracting the answer from a database, not given a list of websites or articles like Googles does. It is operative since 15th of May of 2009.

Since February of 2012, there is a Wolfram Alpha Pro service, which has special and advances functions, but it has a mensual cost for users.

www.WolframAlpha.com