I was excited to see a PollEverywhere alternative here on AppSumo as I've been using the free version for years but always had to work around the limitations. PollGuru has a decent start. It is a bit clunky and needs development to be as smooth and robust as other tools, but it is a step in the right direction. It gets me past previous limitations, so I'll continue to give it a whirl. It will be more valuable when they add the PowerPoint integration.