TriviaBot.Net is a project mainly written in C#, it's free.
Simple Trivia IRC Bot
This code is licensed under GPL v3 - which can be found here: http://www.gnu.org/licenses/gpl.html
I have no idea about the copyright of the questions file - and it sucks, so if anyone can find a better one, feel free to give it to me! :)
(c) Thomas Skovsende