Running With Scissors Video game Developing company, best known for POSTAL series.

Royal Watercolour Society – an English institution of painters working in watercolours.

Remote Weapon Station or Remote Weapon System – A type of small/medium-calibre weapon mounting used on some modern armored military vehicles

Rheinisch-Westfälischen Sprengstoff Werke (Ger. "Rhinelandic-Westphalian Explosives Works") – A brand of rifle cartridges and airgun pellets; marketed by Swiss company RUAG Ammotec since 2002, who also license the RWS brand to Umarex USA for the marketing of their premium line of air rifles.

Roulette Wheel Selection is a selection Genetic operator used in Genetic algorithms.