The GIS software market is historically based on expensive proprietary software, which creates vendor locking and sets an entrance barrier for organizations who want to use such technologies (e.g. think of your local municipality). In recent years, we see more and more Open Source GIS software available, and the business around it starts to get disrupted. It still hasn't spread into the market, but certain sectors already adopted it vastly. This talk will cover the various revolutions happening and which could be adopted quite easily for your benefit.