There is no tool on my desktop that I use more than GuruNet.
Think of GuruNet as a library full of online reference books packed into a small bar on your screen, available the instant you need them. With a single click on any word, GuruNet delivers valuable real-time and reference data, including dictionary and encyclopedia terms, thesaurus, acronyms, technical terms, company descriptions, stock quotes, news, sports, weather, maps and much more.
GuruNet displays an unobtrusive popup window, without interrupting your work. It works within any Windows application. All you have to do is type in your topic--or alt-click on any word or phrase--to bring up its definition or snapshot description. The service is very convenient if you have a broadband connection to the Internet. If you have a dialup Internet service, you will have to connect in order for GuruNet to work its magic.
I am a member of the GuruNet affiliate program. If you would like to try it, click through to the company's website from the advertisement on this page. You are welcome to download and use GuruNet Free for 7 days. After that, you may keep using GuruNet Free, but you will have access to only a limited number of GuruNet reference sources (dictionary, spell checker and thesarus). A license for full access to the GuruNet server costs a one-time fee of $39.99. This will enable the company to maintain its current high level of content, to add new data sources, and to develop new products...
The full version of GuruNet includes dozens of valuable real-time and reference data sources, including company profiles, medical terms, maps, weather, and more.
Below is a partial list of GuruNet data sources; new collections are being added all the time. Sources marked by an asterisk (*) will continue to be available with limited access to the server even if you decide not to pay the one-time $39.99 fee.