The source of Lua [http://www.lua.org/download.html http://www.lua.org/download.html] is extremely excellent. It's in super-portable strict ANSI C and is quite

The source of Lua [http://www.lua.org/download.html http://www.lua.org/download.html] is extremely excellent. It's in super-portable strict ANSI C and is quite impressive in its ability to run pretty much anywhere. It's also very readable. It's very instructive to read the source of the parser and the code generator for the VM. It's well commented and it just flows.