DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. All DOAB services are free of charge and all data is freely available.

OpenStax publish high-quality, peer-reviewed, openly licensed college textbooks that are free online and low cost in print. It also developed a low-cost, research-based courseware that gives students the tools they need to complete their course the first time around, and a new online math homework system with step-level feedback.