From Forum Nokia Wiki

Since the introduction of Carbide.c++ 2.0 the Developer Edition has become an option developers can choose when they install the tool. The Carbide.c++ Developer Edition includes many useful features a Symbian C++ developer may need.

For more information, visit the Carbide.c++ Developer Edition features page on the main Forum Nokia website.

One important feature of Carbide.c++ 2.0 is that the license is available free of charge on any PC,unlike previous version which required you to purchase a license.