Riven Price Calculator for Warframe - Warframe Data
WTS GODLY Opticor 231k+ DMG riven, and good riven for Arca Scisco, Lenz, Soma, and others. - PC: Trading Post - Warframe Forums
I made a riven calculator that tells you the probability (and kuva cost) of getting your desired roll. Fully customizable and easy to use! : r/Warframe