OpenStax has launched their "working groups" for participants to collaborate on and share resources related to OpenStax textbooks. It's free to take part and you may find something useful (even if it's a connection with a potential collaborator).
There are groups for all of the OpenStax textbooks including the two Biology books, Principles of Economics, Introduction to Sociology, two Chemistry books, Anatomy and Physiology, Psychology, and several other subjects.
"Fun, interactive, research-based simulations of physical phenomena from the PhET™ project at the University of Colorado."
These are great simulations to use in class or to have students use at home.