Commercial Publishers and Open Access. Many commercial, academic publishers offer open access publishing for journals and books alike. See a publisher's open access information on their web page for more information about their requirements, possible book or article publishing costs, and areas of disciplinary interest.
Hybrid Journals. Some commercial publishers produce hybrid OA publications where authors can pay an Article Processing Charge (APC) to make their work openly available in publications that usually have toll-access (pay to read) or are subscription-based (readers need a subscription to view a full work).
See this selected list to identify potential publishers, or for examples of their OA policies.