Riven League of Legends Build Calculator - LoLSolved, dragonblade riven
LoL Build Calculator - LoLSolved
Heroes of the Storm Talent Calculator! :: League of Legends (LoL) Forum on MOBAFire
I made a tool that allows you to find the mathematically correct build for any champion (also includes a Practice Tool simulation where you can attack any champ instead of a dummy) :
Riven League of Legends Build Calculator - LoLSolved, dragonblade riven
League of Legends Season 3 item shop simulator lets you prepare for the new patch