Testing: Acobot | Chatbot4U | MyCyberTwin | Pandorabots | Verbotsonline | Ysalaya

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Apple Siri:

Apple Siri

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Artificial Intelligence Resources:

Artificial Intelligence: github | Google Code | SourceForge || Programming Language: Java | Python

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Chatbots:

Chatbot App Videos | Chatbot Forums | Chatbot Keywords | Chatbot Timelines | Chatscript (formerly CHAT-L) | Cleverbot Conversation | Multi Bot Scenarios | SantaBot Tweets | SecondLife Chatbot Videos | SMS Chatbots | Twitter Chatbots Masterlist

Code Projects: Chatbot: github | Google Code | SourceForge || AIML: github | Google Code | SourceForge

Google Patents: Chatterbots | Chatbots | Conversational Agents 

See also: Chatbots 2011 | Chatbots 2010 | Chatbots & SecondLife

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Conversational Expert Systems:

Semantic Reasoner | Inference Engine | Expert System

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IBM Watson:

Best IBM Watson Videos | How Many PlayStations Make A Watson?

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Semantic Dialog Systems:

AutoSPARQL | FREyA | GATE Mímir (GATECloud) | Monrai Cypher | Poweraqua | Pythia | QALL-ME | Texai | YAGO-QA

Notes:

AFAIC, any system that can accept questions in natural language, and issue answers in natural language, qualifies as a defacto "dialog system", even if it is usually referred to as a "question answering system" (QA system).

References:

AutoSPARQL: Let Users Query Your Knowledge Base (2011) [PDF] .. by Jens Lehmann etc

FREyA: an Interactive Way of Querying Linked Data using Natural Language (2011) [PDF] .. by Danica Damljanovic @dancheeee etc

GATE Mímir: Answering Questions Google Can't (2011) [PDF] .. by Mark A. Greenwood etc

Pythia: Compositional meaning construction for ontology-based question answering on the Semantic Web (2011) [PDF] .. by Philipp Cimiano etc

YAGO-QA: Answering Questions by Structured Knowledge Queries (2011) [PDF] .. by Peter Adolphs etc

See also:

SPARQL & Dialog Systems | SPARQL & Natural Language Generation | SPARQL & Natural Language Question Answering (2011)

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Question Answering APIs:

Mnemoo Question-Answering API | True Knowledge API | Wolfram|Alpha API

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Dialog System Resources:

Active Learning & Dialog Systems | Ariadne Spoken Dialogue System | Artificial Intelligence Middleware for Dialog Systems | Case-based Reasoning & Dialog Systems | Construction Grammar & Dialog Systems | Dialog Manager | Dialog Management Middleware | Dialog Move Engines | Dialog System | Dialog System Architectures | Dialog Systems & Concept Mapping | Dialog Systems & Ontologies | Dialog Trees 2011 | Dialog Trees 2010 | DialogueView | DIPPER (Dialogue Prototyping Equipment and Resources) | Head-Driven Phrase Structure Grammar & Dialog Systems | HRI (Human-Robot Interaction) & Dialog Systems 2011 | Machine Translation & Dialog Systems 2011 | Midiki (MITRE Dialogue Kit) | Multi-agent Platforms (MAPs) & Dialog Systems | Multimodal Dialog Systems | N-gram Dialog Systems | OpenCyc & Dialog Systems | POMDP (Partially Observable Markov Decision Process) & Dialog Systems | R Project & Dialog Systems | RBMT (Rule-Based Machine Translation) & Dialog Systems | RST (Rhetorical Structure Theory) & Dialog Systems | Sesame & Dialog Systems | Sentiment Analysis Tools (Open Source) & Dialog Systems | SMT (Statistical Machine Translation) & Dialog Systems 2011 | SPARQL & Dialog Systems | Suggested Upper Merged Ontology (SUMO) & Dialog Systems | Talking Heads & Dialog Systems | TiMBL (Tilburg Memory Based Learner) & Dialog Systems | TRINDIKit (Task oRiented Instructional Dialogue Toolkit) | WITAS Robotic Dialog Environment (RDE) | WordNet & Dialog Systems (2011)