The following links indicate when there are open access options for the research you are searching for. Most will need to be installed on your browser.
DOAJ: Directory of Online Access Journals, a searchable list of OA journals and articles
Knowledge Unlatched: makes scholarly content freely available to everyone and contributes to the further development of the Open Access (OA) infrastructure
NZResearch.org: peer-reviewed and other research from NZ universities, polytechnics, and research organisations. Includes datasets, articles, books, videos