I was not familiar with the terminology “open educational resources (OERs)” until learning about it in this class, but I have been used open educational resources (OERs) for many years in my own teaching.
In statistics, there are many free textbooks and softwares (programming languages) available online. One of the most popular statistical programming language that is also an open educational resource is R, and I have used that extensively in my classes. One can download R online for free and install any package with open licenses. Additionally, users are also welcome to contribute/update with personalized functional packages.
I think that the current proliferation and availability of open educational resources is an important trend in contemporary education. It is a cheap and efficient avenue for the learning process, but care needs to be taken in choosing the resources to ensure quality control.