What is This?

This is an interesting starting point for quick (and perhaps larger) C++ applications. It's optimized for getting stuff done with minimal thought.

It integrates the lazycpp preprocessor to let you combine your class declaration and specification into a single file. The lzz preprocessor then splits this file into the .h and .cpp files you would normally have to maintain separately.
Introduces the convention that each .lzz file contains the implementation of a single class of the same name. This lets us generate predeclarations for all of the classes.
Includes the Boehm garbage collector. Your classes can opt-into garbage collection by extending the gc class.
Includes the QT moc compiler in the build chain so that your classes can also opt-in to the meta-object protocol. This gives you much richer run-time type information than you would typically have.

Why is This?

Maintaining separate .cpp and .h files is annoying (IMO)
Sometimes having garbage collection enables some very interesting design options. Sometimes the stack or reference counting smart pointers are the right answer. Let the developer choose based on the circumstances.