Programming 

Python® is a dynamic object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of higher quality, more maintainable code. - [Details]

The community for developping paypal payment processing scripts. Register to start asking questions, offering solutions, or just learn more about paypal services. - [Details]

A Web site designed to help learning C or C++. Also provides C and C++ programming resources. - [Details]