This list of organizations (in some cases better known as products and/or services than as organizations) is not exhaustive. It does not, notably, include the many universities and libraries creating and adopting open policies and collaborating on efforts to improve the future of open for the researchers at their institutions, or the many organizations advocating for more research spending, more transparency in research, more collaboration, and so on. These efforts are all important and all related to open scholarship.
The initial version of this list was drawn from the work of Jon Tennant and Ross Mounce, “Open Research Glossary,” May 2015, Figshare. http://dx.doi.org/10.6084/m9.figshare.1482094