One of the most used programming tool on this planet is COPY / PASTE. However, using someone else’s work without proper understanding of the code may spell disaster.

One way to avoid re-inventing the wheel and also learn more about the source code you intend to use is to use a source code search engine. I tested the most important and these are the languages supported for search:

http://www.koders.com/

ActionScript,Ada, ASP, Assembler, C, C#, C++ ,Cobol,ColdFusion ,Delphi, Eiffel , Erlang ,Fortran ,Java ,JavaScript ,JSP ,Lisp ,Lua ,Mathematica ,Matlab ,ObjectiveC ,Perl ,PHP ,Prolog ,Python ,Ruby ,Scheme ,Smalltalk ,SQL ,Tcl ,VB ,VB.NET

http://www.codase.com/

Java, C++, C

http://www.google.com/codesearch

Ada, AppleScript ,ASP ,Assembly ,Basic/Visual ,Basic ,C, C++, C#, COBOL ,ColdFusion ,D ,Eiffel, Erlang, Fortran ,Haskell ,Java ,JavaScript, JSP, Lex, Limbo, Lisp, Lua, Makefile, Mathematica, Matlab, Modula-2, Modula-3, Objective C, OCaml, Pascal/Delphi, Perl, PHP, Prolog, Python, R, REBOL, Ruby, Scheme, Shell, Smalltalk, SQL, Standard ML, Tcl, Troff, VHDL, Yacc

http://www.krugle.com/

ActionScript, Ada, AppleScript, ASP, Assembly, Basic, C, C++, C# , ColdFusion , Common Lisp, CSS, Delphi/Pascal, Eiffel, Emacs Lisp, Fortran, Haskell, Java, JavaScript, JSP, Lex/Flex, Lua, ML Objective, C, Perl, Pascal/Delphi, PHP, Python, Ruby, Scheme, Shell Scripts, SQL, TCL, VB.NET, VBScript, XML, Yacc/Bison

http://www.allthecode.com/

Java

http://archive.devx.com/sourcebank/

C, C++, Java, Perl, Assembler, JavaScript, ASP, PHP, XML.

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