Bing is Microsoft’s attempt to challenge Google in the area of search.
Since October 2011 Yahoo search is powered by Bing. Yahoo is still a popular email provider as well.
Formerly known as Ask Jeeves. ASK is based on a question/answer format where most questions are answered by other users or are in the form of polls.
The AOL network includes many popular web sites like engadget.com, techchrunch.com and the huffingtonpost.com.
Wolframalpha is different that all the other search engines. It is marketed as a Computational Knowledge Engine which can give you facts and data for a number of topics. It can do all sorts of calculations, for example if you enter “mortgage 2000” as input it will calculate your loan amount, interest paid etc. based on a number of assumptions.
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).
archive.org is the internet archive search engine. You can use it to find out how a web site looked since 1996. It is very useful tool if you want to trace the history of a domain and examine how it has changed over the years.