Berlin Declaration on Open Access to Knowledge in the Sciences and Humanities is a complementary statement in addition to the BOAI.
Bethesda Statement on Open Access Publishing is a set of principles drafted at a 2003 meeting hosted by the Howard Hughes Medical Institute in Chevy Chase, Maryland. The Budapest, Bethesda, and Berlin statements form the foundational base of statements on open access. Both free access and reuse rights are important components of open access.
Enabling Open Scholarship (EOS) is an organisation for universities and research institutions worldwide. The organisation is both an information service and a forum for raising and discussing issues around the mission of modern universities and research institutions, particularly with regard to the creation, dissemination and preservation of research findings.
Open Access Textbook Initiative - their goal is to support faculty in their efforts to replace traditional commercial textbooks with academically equivalent alternatives that are available at no cost to students.
Opening the Curriculum: Ope Educational Resources in Higher Education, 2014 - report presents results derived from a national-representative sample of higher education teaching faculty