Blekko and DuckDuckGo are two general search engines that are becoming popular as of 2015, and specialist data search engines such as Wolfram Alpha and Quantcast are also becoming more widely used. There are now even search engines that focus on user-generated content, such as Technorati.
As a general search engine, more people are moving to DuckDuckGo because it does not track its users. While this means there is no help in the form of personalized searches, none of the users' history, browsing or typing is recorded, making it effectively trace-free. Blekko organizes its results by category, creating a unique system that can throw up some interesting results.