SIC is a centralized software to manage conventions events and reservations. It can be used either before the convention by users and during the convention by convention operators.
BYOJeopardy is a program to create and play Jeopardy-like games. BYOJeopardy helps you easily build and display jeopardy games. Also, you can export boards to html, so you can play anywhere. This a great tool to use for reviewing topics in the classroom.
The Freya Game Engine is a cross platform Java API for writing multiplayer turn based games. The engine produces XML turn descriptions based on XML command files and XML data dictionaries.