Go look at the TIOBE index ten years ago: https://www.geeks3d.com/20110121/tiobe-index-january-2011-python-wins-the-tiobe-programming-language-award-of-2010/ ht

Go look at the TIOBE index ten years ago: https://www.geeks3d.com/20110121/tiobe-index-january-2011-python-wins-the-tiobe-programming-language-award-of-2010/ https://www.geeks3d.com/20110121/tiobe-index-january-2011-py... Top 5 languages were Java, C, C++, PHP, Python. All five of them were open source in mainstream implementations (Open JDK, GCC, GCC, PHP mainline, Python mainline).