From 2002 to 2007 the Hewlett Foundation poured $68 million into initiatives around open educational resources. The bulk of the money went to the creation and subsidization of resources:
- $43 million went to the creation and dissemination of open content
- $25 million into reducing barriers, understanding, and/or stimulating use. [http://www.hewlett.org/uploads/files/ReviewoftheOERMovement.pdf pdf]
While the foundation was primarily U.S. focused, about $12 million of the funds up until 2007 went to international efforts, including $6 million to the developing world.
By 2013, Hewlett had begun to shift from their focus on supply to a focus on adoption. [http://www.hewlett.org/sites/default/files/OER%20White%20Paper%20Nov%2022%202013%20Final_0.pdf cite] But the impact on terminology had been set, and it’s influence is seen both in statements from the U.S.’s Education Department, and the 2012 Paris Declaration on OER.
Carnegie also played a large part in early OER efforts, and the Gates foundation has been a recent entry.
You might also be interested in Rising Support for Open Materials