I’ve been meaning to post a link to Vincent Lextrait’s nice (and actively maintained) catalog of what languages are used to build what modern and major mainstream software:
This table contains a list of major software products or utilities, with details about the programming languages used to implement them. Information on this is difficult to find, and a few small mistakes might have escaped the author‘s attention. Corrections, suggestions for additions or even references are welcome. …
A nice data point to use to show that the world is built on C++ (and its C subset).
The table was compiled without bias on the part of the person who compiled it; he’s just trying to gather information. If you think a language is under-represented, send mail to Vincent with specific project data (make sure it’s something you know of first-hand or can point to an authoritative source) and I’m sure he’ll be glad to add it.