This is a port of Chat-80 to Ciao packaged as a Ciao bundle. It can be installed with:
$ ciao get github.com/ciao-lang/chat80
Then it can be started with:
$ chat80
Chat-80 was a prototype natural language question answering system developed by David H. D. Warren and Fernando Pereira in 1982. See the original paper for a more detailed description (recovered from the web archive).