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