DynASM with Lua mode
luapower.com
luapower.com
I'm not sure how it differs from LuaRocks (which is the "original" Lua package manager) and LuaDist. I guess it aims for more simplicity? The website definitely outshines the other two, I like the clear and simple overview of the available packages.
EDIT: Upon closer inspection, it seems that it's the first package manager to properly integrate LuaJIT. So yeah, I'm converted!