cwc is a very useful crossword compiler program written by Lars Christensen which is based on the algorithms described in Sik Cambon Jensen's thesis "Design and Implementation of Crossword Compilation Programs Using Serial Approaches". I have not been able to contact Lars to ask whether he is still maintaining cwc, since the email address (larsch@cs.auc.dk) on the two webpages I've found for the program no longer works and Lars Chistensen is a very common name. However, I wanted to release a version with a few new features, so I'm publishing these here, and hope that people find this version useful. If you would like to contribute changes, or have any other feedback please email me.