Here is a link to the finite field visualizer. Now, I can't say I am extremely comfortable in using either of the yet but I am looking forward to making use of them.
Please let me know what you think of them, as well as possible investigations to explore with them.
I have a Master's of Education course coming up this January and I am looking forward to showing and sharing the benefits of teaching with finite fields. I think this is actually the only way to quickly get points across to students effectively. Mainly because of the multiple 1s and 0s in these fields.
As well as, as Wildberger states, the beautifully connected number theoretic results that can emerge intuitively.
All the best,