http://sourceforge.net: The best place to find OpenSource applications and source code.
http://www.codeproject.com: A place for free C++, C# and .NET articles, code snippets, discussions, news.
http://www.codeguru.com: Similar site to www.codeproject.com.
http://www.linuxapps.com: Linux applications and source code.
http://www.programmersheaven.com: Over 20986 files, links and articles to explore.

On-line C++ tutorials: The purpose of this tutorial is to give a good understanding of the programming language C++.
http://www.cprogramming.com: C and C++ tutorials and programming resources.
http://www.programmingtutorials.com: Over 150 tutorials on many programming languages and message forums.