Google Code Search is the only search engine that indexes GitHub repositories. I find that almost all open source projects are in GitHub in one way or another,

Google Code Search is the only search engine that indexes GitHub repositories. I find that almost all open source projects are in GitHub in one way or another, and GH doesn't let you search the actual code I use it, and I know other people do, to find software exploits. For eg. here is a search to find open source software that trusts the X-Forwarded-For HTTP request header: http://www.google.com/codesearch#search/&q=%22X_FORWARDED_FOR%22&type=cs http://www.google.com/codesearch#search/&q=%22X_FORWARDE... http://koders.com/default.aspx?s=%22X_FORWARDED_FOR%22&search.x=0&search.y=0&la=*&li=*&scope= http://koders.com/default.aspx?s=%22X_FORWARDED_FOR%22&s... I hope GitHub implement their own code search now