VotAR is a free Augmented Reality audience voting or survey system designed for teachers and speakers or conference organizers. It allows the audience to hold up papers with a special printed symbol to vote, and the speaker takes a photo of it with the app, which then analyzes the photo to count the votes.

One of the main advantages of VotAR is that it can make speeches more lively and memorable by engaging the audience and getting their opinions. It also helps speakers adjust their speeches accordingly without spending thousands on clickers.

However, it's important to read the documentation before usage to ensure a good detection rate and solve any network problems that may arise. In addition, users should download and print out the voting papers before the event and test the app beforehand to avoid any issues on the big day.

Overall, VotAR is a useful and innovative tool for engaging the audience and making speeches more interactive. It's also worth noting that VotAR is a Libre/FreeSoftware project, which adds to its appeal.