Hindawi Publishing Corporation, which publishes more than 125 open access journals, has launched an Open Access Institutional Membership program that allows institutions to subsidize Hindawi's article processing charges for their authors.
Here's an excerpt from the press release:
Hindawi's membership program is based on a flat rate payment that covers all accepted articles that are submitted by an author from a member institute during the period of the membership. The cost of the membership depends on the level of research output of the institute and their historical publishing pattern in Hindawi journals. . . .
In addition to the 125+ open access journals that Hindawi currently publishes, this membership will include any journal that is added to Hindawi's collection during the term of the membership.