Program D is a widely used AIML bot platform. It is feature-complete and well-tested. It supports unlimited multiple bots in a single server instance, and has an open-ended architecture for interacting via any interface imaginable. The standard release provides a J2EE Web application implementation. Drop-in listeners are available for IRC, AIM, and Yahoo!. It includes an automated testing framework for testing knowledge bases, and is packaged with an AIML Test Suite that verifies that the program itself complies to the AIML specification.