Watchapp dev language.

The core of the arcapos applications is written in C, so are most of the Lua modules (bindings to various hardware or protocols).

The Game Pencil Engine Editor is coded in C/C++.

been programming in c for over a decade, since learning it in college. still use it for various low level projects. used it recently to develop an embedded application for a custom board.

Used in backend and clients for performance heavy tasks.

The Sqreen PHP agent is both a PHP extension, built in C, and a daemon built in Python.

Axis2/c, rampart/c, savan/c, barbershop and custom php extensions.

As long as you don't abuse def and Closure

NPL solutions and statistical machine learning.