This is a very simple website templating engine based on markdown and Lua, written by Tuomo Valkonen 〈email@example.com〉.
It is not particularly supported or maintained; it was created back in 2009 to build my own website. The engine is still being used for that purpose. I decided to put the code online now in 2017 after having had to spend some time to convert it to Lua 5.3 from which the module() function had been removed.
Aside from the included compat_env.lua and the ltp engine (which is has not updated to Lua 5.3, and requires the compat_env module), the code is in the public domain.