Source code search Engines

If you don't want to spend more time in writing code instead just want to use already written code for the same feature that you are looking for then here are the list for few popular search code engines.
S.No. Code Engine Description
1 https://github.com/ Code repository, contains many opensource projects
2 http://www.javased.com/ Search engine for Java code search
3 https://searchcode.com/ General code search engine.
4 https://you.com General code search engine.
5 https://publicwww.com/ Crawl web for code snippit.

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