In fact after digging through Google search results, I got to know that this tool existed for quite some time 🙁
Koders.com is the leading search engine for open source code. Our source code optimized search engine provides developers with an easy-to-use interface to search for source code examples and discover new open source projects which can be leveraged in their applications.
Every month Koders generates a report on the keywords used in the search tool. It generates a list of top searched keyword, top solutions (i.e. downloaded code) and top projects.
On the enterprise side, Koders offer an “Enterprise Edition” which can be used by companies to index their internal codebase.