An increasing number of funding organizations require publications on the research that they fund to be open access, i.e. available to the public without having to subscribe to a journal or pay a fee. Does anybody know where I can find a list of journals/publishers that do not allow material that they publish to be published this way?
Directory of open access journals is the most comprehensive listing for the open access ones, so if you find a journal there, it's open. If not, then you need further research. Though usually clicking on an article link should be sufficient.