I was looking recently at the PYPL PopularitY of Programming Language.
That site ranks popularity of programming languages (Java is #1) using Google Trends tools based on searches of the form <Language Name> Tutorial. I did my own Google Trend search, comparing the 3M of Computer Algebra Systems: Maple, Mathematica, and Maxima using the Tutorial criteria as at PYPL.
With the data from Google Trends, I computed the proportion of the total 3M monthly searches for each program. Here’s how that looks over time since 2004:
It appears to me that Maxima is slowly and steadily gaining with nearly 20% share, Maple is currently at about 30%, and Mathematica at 50%. Does anybody know what happened between 2006 and 2013 to account for the increase in popularity of Mathematica and decrease for Maple?
The MaximaList 
Wolfram Research launched the Wolfram Alpha webapp. in May 2009. I wonder if that has been contributing to the kowledge and popularity of Mathmatica?
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