Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.
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OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
Top Similar Sites - Top Similar Sites helps you find similar, alternative or related sites to any website instantly.
GrepCode - GrepCode.com is a code search engine built by developers for developers to search and browse open...
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.