ChainForge is a visual programming environment designed for prompt engineering, allowing users to evaluate and test prompts for large language models (LLMs). It supports various use cases such as assessing prompt effectiveness, conducting adversarial testing, and evaluating model performance. The platform also facilitates the customization of LLMs through its documentation on adding custom providers. Users can find practical examples and tutorials on the ChainForge website and GitHub repository, including a case study on Twitter and a video demonstrating LLM prompt injection attacks and vulnerability testing. Additionally, ChainForge is working on enhancing its functionality by enabling internal and proxy network environments.