C++:
C++ Home – http://www.cplusplus.com/
C++ Tutorials – http://www.cplusplus.com/doc/tutorial/
LearnC++ Tutorials – http://www.learncpp.com/
Java:
Java “Getting Started” Tutorials – http://docs.oracle.com/javase/tutorial/java/index.html
Java Tutorials – http://docs.oracle.com/javase/tutorial/
Processing:
Processing Home – http://processing.org/
Processing Tutorials – http://processing.org/learning/
Processing Reference – http://processing.org/reference/
Learn Processing Tutorials – http://www.learningprocessing.com/tutorials/