ChatScript

ChatScript is the next generation chatbot engine that won the 2010 Loebner Prize with Suzette, 2011 Loebner with Rosette, and 2nd in 2012 Loebner with Angela (a bug I introduced in the Loebner protocol, not the engine). The technology behind Outfit7's mobile app Tom Loves Angela and ESL chatbots at Japan's SpeakGlobal. 3rd place winner Chatbot Battles 2012 and awarded best 15 minute conversation prize. 3rd place Loebner winner for 2013 and 1st place in 2014 and 2015.

Also has useful ontology files for nouns, verbs, adjectives, adverbs. Stand-alone or server modes. LINUX ( 64 bit) and Windows (Visual Studio 10) and Mac/iOS.

https://sourceforge.net/projects/chatscript/