An open-ended student response system is an electronic service or application that lets students enter text responses during a lecture or class discussion. Open-ended systems give faculty the option of collecting such free-form contributions from students, in addition to asking the true/false or multiple-choice questions that conventional clicker systems allow. Such tools open a channel for the kind of individual, creative student responses that can alter the character of learning. The great strength of open-ended student response systems may be that they create another avenue for discussion, allowing students to join a virtual conversation at those times when speaking out in live discourse might seem inappropriate, intimidating, or difficult.
Looks like they beat us to it.