I'm going to plug my old employer here for this, https://www.polleverywhere.com/ https://www.polleverywhere.com/ . We heavily used the service internally and th

I'm going to plug my old employer here for this, https://www.polleverywhere.com/ https://www.polleverywhere.com/ . We heavily used the service internally and the anonymous "Q&A" used for retros and brainstorming was eye-opening to say the least.