Scientists are spoilt for choice in open access publishing - BioMed Central, eLife, F1000Research, Frontiers, Hindawi, Libertas Academica, MDPI, PeerJ, Pensoft Publishers, PLOS, Any affordable open access journal for Humanties and Social Science
DOAJ is a great start but many scholarly presses who produce journals don't have their journals listed in DOAJ. You can see journals produced by open access presses in some Australian universities here - https://caullibrarypublishing.wordpress.com/ in the box on the left hand side "Australian University presses – in University libraries".
Also, you can try the new Open Library of the Humanities (OLH), launched in last September 2015 with seven journals, supported by 99 institutions: https://www.openlibhums.org/ - See more about: OLH release announcement: https://about.openlibhums.org/2015/09/28/olh-launches/ and an interview with Martin Paul Eve, OLH co-founder: http://chronicle.com/blogs/profhacker/a-public-library-of-the-humanities-an-interview-with-martin-paul-eve/56767?utm_content=buffer303f3&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer.