If you'd like a free copy of something, grab one from the Community Copies or send me a message. I don't want money to be a barrier for people.
If you'd like to release your own content based on one of these games, for example a module, expansion, hack, or translation, check the licensing on the first page. In most cases, non-commercial stuff is 100% okay, and commercial stuff is either fine if you ask me first or it's explicitly encouraged. That said, there may be some exceptions.
Reviews and feedback, positive or negative, are always hugely appreciated but never required.