Here is a graph showing how often people entered the search term “QGIS” into Google over the last 10 years. It was generated using Google Trends, a Google utility that displays trend graphs and basic regional statistics of search terms entered into the world’s most popular search engine.
It’s also possible to compare search terms e.g. QGIS v’s MapInfo, QGIS v’s Microstation, QGIS v’s Geomedia and finally QGIS v’s ArcGIS.
The frequency of most GIS related search terms entered into Google, except “ArcGIS” and “QGIS”, have decreased considerably over the last 10 years. Only ArcGIS is entered into Google more often than QGIS nowadays, indeed ArcGIS has likely attained a monopoly market position. However, it is likely that QGIS will continue to gain ground on ArcGIS and desktop GIS may become a dichotomy of commercial and opensource software, a reaction to one companies’ market dominance.