Open Education Resouces are free-to-use information resources made legally available online. They are "free" not only in that there is no cost to the user, but they also usually have generous copyright licenses that allow for sharing, reproduction, and making derivative works, and access is not restricted by geography, subscriptions, or other such barriers. All kinds of media and genres can be OERs, including books, articles, videos, software, educational kits, and more.
You can also develop OERs of your own for the benefit of your field and your own professional development. Using an Open publishing model will make your work available to more readers, which could increase the number of people citing your work.