30log has been recently updated to 1.0.0.
It's a short library for object orientation in Lua, which provides lightweight support for classes, instantiation, inheritance and mixins.
The project lives at github: http://github.com/Yonaba/30log
Detailled instructions on how to download and install it (via LuaRocks or MoonRocks), documentation and specification can be found on the Github repository.
As always, feedback is very much appreciated.