I would agree that generally Lua has been used for games... But NodeMCU is one of the more well known ESPxx microcontroller firmwares, Adobe Lightroom uses Lua

I would agree that generally Lua has been used for games... But NodeMCU is one of the more well known ESPxx microcontroller firmwares, Adobe Lightroom uses Lua for plugins, and just now I found this big list as well on wikipedia: https://en.wikipedia.org/wiki/List_of_applications_using_Lua https://en.wikipedia.org/wiki/List_of_applications_using_Lua More notably for myself, my work's robotics applications are developed with Lua 4.1, so you might actually find the small embeddable language used in more places than you might expect, especially where you don't want to do the scripting level work ( business layer) in C/C++ at the same layer your low level real-time stack operates.