This is a video of a math teacher explaining multiple representations and then showing how to solve problems using tables, equations, and graphs. I chose this example because it was a video. Of course, it is a bit dry but it does show how multiple representations can be used to mean the same thing.
When I was searching, I found software from TI called Nspirations. I did not use the software, but I wanted to point out that it looked like it could be a useful tool in graphically representating different math concepts. I know there are many vendors out there, but I think many schools still use TI graphing calculators and this software works well with these calculators. Also, from the brochureware, there also appeared to be content information as well.