- Open access publishing has grown significantly in recent years with more open access mandates, publishers, central funds, and impact factors for open access journals. - BioMed Central is the largest open access publisher, publishing over 190 journals and 44,000 articles under Creative Commons licenses. It covers costs through article processing charges (APCs) and other revenue streams. - Many funders now mandate open access, increasing author compliance for open access. More institutions are also establishing central funds to pay article processing fees.