One of my large and ever-unfinished projects is a Home Automation system. This is designed as multiple processes where most of them are Lua script engines along with several C++ processes as well that handle low-level interfacing and infrastructure for the system.
This is all running on a RaspberryPi.
As part of this effort, I wrote a simple Lua web server to allow access to the system from a browser or a custom iOS app. Since this Lua web server might be useful to others, I am making it available as a separate component.
It is quite simple, but for serving JSON and HTML, and responding to requests (JSON or otherwise) in a low-demand system like personal home automation, it should be just fine.
Note that this depends on the Lua socket library being present.