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.
CrossBOT is an open source crossword construction system that features an advanced "stand alone" crossword compiler, based on consistency and intelligent backtracking algorithms, along with a web interface.