Sometimes when you’re playing an RPG you really just need to be able to show a picture to your players, or collaborate using note cards, a whiteboard, etc. For those circumstances, I recommend using one of these tools:
Miro (formerly RealTimeBoard) is the best free(ish) whiteboard application. It is easy and intuitive to use with lots of different functions (drawing, shapes, sticky notes, upload, chat…) and it actually works with a digitizer pen for those of us who have 2-in-1 laptops. You can only have 3 boards at a time on the free tier — however you can export boards when you’re done, and then delete them to free up space.
The whiteboard built-in to zoom is pretty crappy, but if you’re already using zoom and your needs are quite basic, it’s right there.
If you prepare and use a lot of visual aids during your games, you might find it really helpful to set up a google slides presentation. You can open the presentation and then screenshare it with your players through your vc application, then just click to the next slide when you need to show them a new picture. You could even integrate sound effects and animations to be extra theatrical.