Don't know how useful this web app will be to any teachers, but the story behind this is very cool. I found this in the Chrome Store.
The "Harkness App" was created by two 8th graders. They did it themselves without any outside help, and it began as a project to help track involvement in their teachers Harkness discussions. Instead of doing it manually, you can do it on a laptop, over the web, and then have it shared easily with students online. This might be a very cool tool to track harkness discussions and share easily with students, while conserving paper. Very cool app, especially as it was developed by some middle-schoolers.