The use of OER chemistry textbooks steadily grew in the last decade driven by high costs of commercial offerings, universal access to the Internet and the collapse of the commercial textbook market. The sudden onset of the Covid epidemic set off an avalanche as classes across the world moved online and instructors scurried to create custom textbooks and laboratory manuals for their students. The lack of open low cost homework systems and test banks was a particular problem. This seminar invites those who were already using OER in their classes, those who suddenly found themselves building and using OER and those who are OER curious. Presentations are sought to discuss the best pedagological practices for creation of Chemistry OER and the optimal technology for doing so. Looking forward presentations are solicited that describe how OER and associated technologies can balance between customization and universal access, and how, within the UNESCO definition of OER, they can allow no-cost access, use, adaptation and redistribution by others with no or limited restrictions.