OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print.

Google Scholar provides a simple way to broadly search for scholarly literature. Search across a wide variety of disciplines and sources.

The DepEd Commons is an online platform for public school teachers to support distance learning modalities. It was designed as a direct solution to give access to online review materials and Open Educational Resources (OERs) during class suspensions and other similar circumstances.