Open Education Resources are teaching, learning and research materials in any medium - digital or otherwise - that reside in the public domain or have been released under an open license that permits no-cost access, use, adaption and redistribution by others with no or limited restrictions. Source: The William and Flora Hewlett Foundation
Dacus Library has a Research Guide on OER that contains lots of information about OER and links to collections of OER materials.
OER Commons: Dance collection - OER Commons is a public digital library of open educational resources.
Dance resources on MERLOT - MERLOT provides access to curated online learning and support materials.