Where to download source code for C++ progrms?????

Hi friends,
I hope everyone is fine and doing well. I have been doing a little bit of programming in c++ for a while. I think I am sufficiently good at c++ concepts. I just want to go advanced and learn some serious stuff. I was wondering if there was a website from where I could download the source code of different c++ programs, specially programs which run under UNIX( Solaris, FreeBSD, Linux) etc. I want to study the serious code, and hopefully learn some serious programming from it. Looking forward to your wonderful replies.
Thanks in advance!
closed account (zb0S216C)
Try Source Forge; they have loads of open-source projects available for free.

Source Forge and GitHub are the only two places I can think of right off.
source forge,github,and other open source code for example mongodb
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