These ebuilds come from http://git.overlays.gentoo.org/gitweb/?p=proj/lua.git;a=summary.
If you have some problems, go to the official site first.
LuaBitOp : Bit Operations Library for the Lua Programming Language ( http://bitop.luajit.org )
cosmo : safe-template engine for lua ( https://github.com/mascarenhas/cosmo )
coxpcall : Lua coxpcall Library ( https://github.com/keplerproject/coxpcall )
iluajit : Readline powered shell for LuaJIT ( https://github.com/jdesgats/ILuaJIT )
linotify : inotify bindings for Lua ( https://github.com/hoelzro/linotify )
ljsyscall : Lua JSON Library, written in C ( https://github.com/justincormack/ljsyscall )
lsysstats : XMPP client library written in Lua. ( http://code.mathewwild.co.uk/ )
lua-cjson : Lua JSON Library, written in C ( http://www.kyne.com.au/~mark/software/lua-cjson.php )
lua-fann : A set of Lua bindings for the Fast Artificial Neural Network (FANN) library. ( https://github.com/msva/lua-fann )
lua-fastcgi : A FastCGI server for Lua, written in C ( https://github.com/cramey/lua-fastcgi )
lua-gd : Lua bindings to Thomas Boutell's gd library ( http://lua-gd.luaforge.net/ )
lua-zip : Lua bindings to libzip ( http://github.com/brimworks/lua-zip )
lua-zlib : Lua bindings to zlib ( http://github.com/brimworks/lua-zlib )
lua2html : Lua to HTML code converter written in Lua. ( http://code.mathewwild.co.uk/ )
luacrypto : Lua Crypto Library ( https://github.com/msva/lua-crypto )
luadbi : DBI module for Lua ( http://code.matthewwild.co.uk/luadbi )
luadoc : LuaDoc is a documentation tool for Lua source code ( http://luadoc.luaforge.net/ )
luaevent : libevent bindings for Lua ( http://luaforge.net/projects/luaevent http://repo.or.cz/w/luaevent.git )
luaexpat : XMPP client library written in Lua. ( http://code.mathewwild.co.uk/ )
luafilesystem : File System Library for the Lua Programming Language ( http://keplerproject.github.com/luafilesystem/ )
luancurses : Lua NCurses Library ( https://github.com/msva/lua-ncurses )
luarocks : A deployment and management system for Lua modules ( http://www.luarocks.org )
luasec : Lua binding for OpenSSL library to provide TLS/SSL communication. ( http://www.inf.puc-rio.br/~brunoos/luasec/ )
luasignal : Lua signal Library ( https://github.com/msva/lua-signal )
luasocket : Networking support library for the Lua language. ( http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/ )
luaxml : A minimal set of XML processing function in Lua, with simple mapping between XML and Lua tables ( http://github.com/LuaDist/luaxml )
orbit : MVC Web Framework for Lua ( https://github.com/keplerproject/orbit )
penlight : A set of pure Lua libraries focusing on input data handling, functional programming and OS path management. ( https://github.com/stevedonovan/Penlight )
squish : XMPP client library written in Lua. ( http://code.mathewwild.co.uk/ )
toluapp : A tool to integrate C/C++ code with Lua. ( http://www.codenix.com/~tolua/ )
verse : XMPP client library written in Lua. ( http://code.mathewwild.co.uk/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a lua
For Paludis use this rsync : rsync://gentoo.zugaina.org/lua-portage
If you have a problem : ycarus(-at-)zugaina.org