Until recently, Croatian scientific journals were accessible only in print form and only to a relatively small audience. A national online journals platform was therefore planned to offer publishers a simple tool for building online versions of their journals and to make them open access (OA). The platform, named Hrčak, was launched in 2006, and its development and maintenance are supported by governmental funds. It currently includes 170 open access journals. Most journals include backfiles from 2006 onwards, but 19 journals have archived all back issues. The average archived period is 6.3 years and 56.5% of the journals come from the fields of social sciences and humanities. Metadata from the Hrčak platform are regularly harvested by OA repositories like OAIster, Base etc. and search engines like Google Scholar. In order to increase the number of Croatian journals covered by relevant interdisciplinary and subject oriented databases and to speed up their indexing process, Hrčak also established cooperation with Elsevier (Scopus), Thomson Reuters (Web of Science) and EBSCO (Academic Search Premier). So far, the Hrčak platform's main achievements include assisting publishers of small scientific journals in the process of electronic publishing, together with improved accessibility of the output of the Croatian scientific community.