.. R.R RPG IV.rpgle RPG.rpgle RTL2.rtl2 Racket.rkt Radixal.radixal RatFor.ratfor React.js React360.js Readlink.readlink RealBasic.realbasic Reason.re Rebol.r Rebol.reb Recurse.recurse Red.red Redis Refal.ref Retro.retro Rexx.rexx Ricktea.tea Ride.ride Ring.ring RiveScript.rive Rockstar.rock Roco.roco Roy.roy Ruby.rb Ruota.ruo Rust.rs reStructuredText.rst