Ultra Hal is a chatbot intended to function as a virtual assistant. It was developed by Zabaware, Inc.
Ultra Hal uses a natural language interface with animated characters using speech synthesis. Users can communicate with the chatterbot via typing or via a speech recognition engine. It utilizes the WordNet lexical dictionary. Its name is an allusion to HAL 9000, the artificial intelligence from the movie '.
Ultra Hal won the 2007 Loebner Prize for "most human" chatterbot.