My grandmother taught Language Arts for decades and she loved crossword puzzles. I know that many other teachers still like to use them in one way or another too. If you would like to create your own crossword puzzles for your students or you want them to create crossword puzzles, take a look at Read Write Think's Crossword Puzzle Tool.
Read Write Think's Crossword Puzzle Generator makes it easy to create your own crossword puzzles. To create your puzzle simply enter a list of words, a set of clues for your words, and then let the generator make a puzzle for you. You can test the puzzle before printing it. You can print blank puzzles and answer sheets from the puzzle generator.
Applications for Education
Read Write Think offers a bunch of free lesson plans that incorporate crossword puzzles. Some of the lesson plans are designed for learning synonyms. Other lesson plans teach students the vocabulary space travel.