A search engine is an information retrieval system designed to help find information stored on the world wide web. The search results are usually presented in a list and are commonly called hits. Most people only use Google to search for information, but did you know there are many other search engines available on the Internet? Check out the list of Search Engines below.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Wikipedia
Family-friendly safe search engine for kids powered by Google custom search.
Wolfram Alpha is more than a search engine. It gives you access to the world's facts and data and calculates answers across a range of topics, including science and maths. It is an online service that answers factual queries directly by computing the answer from externally sourced "curated data", rather than providing a list of documents or web pages that might contain the answer. Highly recommended by students!
Has a number of advantages over the other search engines. It has a clean interface, it does not track users, it is not fully loaded with ads and has a number of very nice features (only one page of results, you can search directly other web sites etc).