Interested to know what the most popular GIS software is?  To see what the GIS industry is using, an article from GISGeography.com maps out the GIS software landscape and lists the top 30 GIS desktop options using the following ranking guidelines:

• 40% is based on which GIS software is required by employers in job postings
• 20% is based on which GIS software is being used in research and publications
• 20% is based on which GIS software is being searched for
• 20% is based on which GIS software is being discussed in community forums