CADIS - 37 KB of bot hand coded with love by Peter Hurford 2007-08.
Still much a work in progress.

Current Knowledge

Output of conversation is based on user input. CADIS will learn from all conversations.
Biographies - "who is {}".
Calculator - "what is {}", "calculate {}". Wide range of features here for natural language and complex calculations.
Capitals - "what is the capital of {}".
Clock - "what time is it"
Correction system - "bad {}" where {} is what you felt CADIS should have said. You must be logged in for this feature.
Dictionary - "what is {}", "what does {} mean?", "what is the meaning of {}" or "define {}".
Political Leaders - "who is the head of state of {}", "who is the president of {}", "who is the leader of {}" etc.
Many more features coming soon.

Of course, CADIS also has a learning and constantly expanding conversational database. Special thanks to all those who have expanded it.