Working with a tight budget – Free Tools for BarCamps

We love BarCamps! Therefore, we are always happy to support such an event. We think that such a young and innovative event format deserves all the help it can get.
We are often asked if there are any other good, and most importantly, free tools that are suitable for hosting BarCamps. In addition, we have been to some Barcamps and want to show you what the organisers use there.