This is LuaRocks, a deployment and management system for Lua modules.
Main website: luarocks.org
LuaRocks allows you to install Lua modules as self-contained packages called rocks, which also contain version dependency information. This information is used both during installation, so that when one rock is requested all rocks it depends on are installed as well, and at run time, so that when a module is required, the correct version is loaded. LuaRocks supports both local and remote repositories, and multiple local rocks trees. You can download and install LuaRocks on Unix and Windows.
LuaRocks is free software and uses the same license as Lua 5.1.