Gizmos

I found this website in my quest for new tools and simulations. It's called Gizmos. The screenshot below shows their photosynthesis activity. 

The simulations are reminiscent of PhET from the University of Colorado Boulder. They look amazing, but I do not have a paid account to delve into it. You can look at the simulations for up to five minutes per day without an account. After that, you must sign up for an account. The free trial is offered for a limited time before a paid subscription is required.

What other resources have you found?