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http://pypl.github.io/PYPL.html

http://githut.info/

https://github.com/blog/2047-language-trends-on-github

http://blog.codeeval.com/codeevalblog/2016/2/2/most-popular-coding-languages-of-2016

https://www.indeed.com/jobtrends/q-java-q-python-q-javascript-q-ruby-q-php-q-android-q-C.html

https://zeroturnaround.com/rebellabs/java-tools-and-technologies-landscape-2016/

https://mvnrepository.com/popular

https://zeroturnaround.com/rebellabs/java-tools-and-technologies-landscape-2016/

!! :)