rtlcss
Framework for transforming cascading style sheets (CSS) from left-to-right (LTR) to right-to-left (RTL)
cssjanus
Convert CSS stylesheets between left-to-right and right-to-left directions.
postcss-rtlcss
PostCSS plugin to build Cascading Style Sheets (CSS) with Left-To-Right (LTR) and Right-To-Left (RTL) rules