This package contains less-css-mode.el, which provides an Emacs mode for LESS CSS (lesscss.org), complete with support for compile-on-save.
For flymake support, see flymake-less, though you should really use flycheck instead.
If you'd like Emacs to make your browser magically reload your LESS stylesheets, consider using skewer-less.
Please see documentation in less-css-mode.el
