Google Docs is a free, Web-based word processor, spreadsheet, presentation, and form application offered by Google. It allows users to create and edit documents online while collaborating in real-time with other users.
Google Scholar allows users to search for digital or physical copies of articles, whether they be online or in libraries.
Using its "group of" feature, it shows the various available links to the journal article. As of December 2006, it provides access to both published versions and on major open access repositories, but does still not cover individual university pages; access to such self-archived non-subscription versions is now provided by a link to Google, where one can find such open access articles.
Through its "cited by" feature, Google Scholar provides access to abstracts of articles that have cited the article being viewed. It is this feature in particular that provides the citation indexing previously only found in Scopus and Web of Knowledge. Through its "Related articles" feature, Google Scholar presents a list of closely related articles, ranked primarily by how similar these articles are to the original result, but also taking into account the relevance of each paper.
Google Earth is a virtual globe, map and geographic information program that maps the earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS 3D globe. Google Earth displays satellite images of varying resolution of the Earth's surface, allowing users to visually see things like cities and houses from a bird's eye view. The degree of resolution available is based somewhat on the points of interest and popularity, but most land (except for some islands) is covered in at least 15 meters of resolution.
YouTube, now owned by Google, is a video sharing website where users can upload, view and share video clips. With its easy to use interface, YouTube makes it possible for anyone who can use a computer to post a video within a few minutest hat millions of people can watch. The wide range of topics covered by YouTube has turned video sharing into one of the most important parts of Internet culture.
Google Video is a free video sharing website and also a video service from Google that allows anyone to upload video clips to Google's web servers as well as make their own media available free of charge.
Google Book Search is a tool from Google that searches the full text of books that Google scans, converts to text using optical character recognition, and stores in its digital database. When relevant to a user's keyword search, up to three results from the Google Book Search index are displayed above search results in the Google Web Search service (google.com). A user may also search just for books at the dedicated Google Book Search service. Clicking a result from Google Book Search opens an interface in which the user may view pages from the book as well as content-related advertisements and links to the publisher's website and booksellers. Through a variety of access limitations and security measures, some based on user-tracking, Google limits the number of viewable pages and attempts to prevent page printing and text copying of material under copyright.
Google searches can take advantage of the Advanced Search features that can increase the accuracy and effectiveness of searches on Google Scholar by adding "operators" that fine-tune search terms.
All information quoted from Google.com, Googlepedia: The Ultimate Google Resource, and Wikipedia.com.