UC Berkeley authors have several free options to publish their article in open access journals. Listed below are three rapid dissemination OA journals where articles are peer reviewed in which Berkeley authors can publish without paying an article processing charge (APC).
PeerJ: publishes original research in the biological, medical and health sciences. Due to a partnership with the Berkeley Library, there is no cost for Berkeley authors to publish in PeerJ.
SAGE Open: publishes original research and review articles in humanities, social and behavioral sciences. The Library underwrites Berkeley authors’ publishing costs. This also includes AERA Open and some other OA journals hosted by SAGE.
eLife: publishes original research in life sciences and biomedicine. It is free to publish in eLife while the journal is being established though there are plans to institute article processing charges for authors in the future. 
More information on open access at UC Berkeley is available from this guide. Information on the UC Open Access Policy is here.