Which Python package allows the addition of natural language commands to interactive applications?

The addition of natural language commands to interactive applications is primarily facilitated by specific libraries designed for natural language processing and interactive command handling. Among the listed options, the choice mentioning NVIDIA Project Mellon is correct because it is a toolkit designed to enhance the interactivity of applications through natural language processing, allowing developers to incorporate voice and text commands seamlessly into their applications.

The other options either do not exist as recognized libraries or do not specifically focus on enabling natural language commands in an interactive context. For instance, TensorFlow is a well-known machine learning framework, but it does not directly address adding natural language commands to interactive applications. The Interactive Command Toolkit and AI Application Suite may be relevant in different contexts but do not specifically refer to tools aimed at this particular function. Thus, the correct answer highlights a specialized approach to incorporating natural language interaction in applications.