The content of all journals is freely available also through web services. A link to the web services for each separate journal is available through the journal's About page (Journal Web Address/about#Web-services).
Here is an example how one can get the content published in the Biodiversity Data Journal:
Link to the web services of the Biodiversity Data Journal:
OAI-PMH - oai_dc: http://bdj.pensoft.net/oai.php?verb=ListRecords&set=bdj&metadataPrefix=oai_dc
OAI-PMH - mods: http://bdj.pensoft.net/oai.php?verb=ListRecords&set=bdj&metadataPrefix=mods
RSS for metadata: http://bdj.pensoft.net/rss.php