UNESCO defines open educational resources (OERs) as "... teaching, learning or research materials that are in the public domain or released with an intellectual property license that allows for free use, adaptation, and distribution."
Below are a selection of quality OERs for linguistics:
+61 2 6125 5111
The Australian National University, Canberra
CRICOS Provider : 00120C
ABN : 52 234 063 906