where can i find best and big library source code
What king of source code are you looking for???
I don't think I am getting all of what you want. Do you want the codes of different programs, or just different libraries to it? If you are looking for the libraries, you can check www.sourceforge.net (great site in general). Otherwise, for software, you might have a hard getting the codes, specially if they are proprietary.
If you go into the opensource software, then you get the source of every software. Cheers
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