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) :
League of Legends: Kayn Might Actually Be Good Again Thanks to Patch 12.23 | Player.One
Live In-Game Damage Calculator Overlay - Great for Pyke Mains - (in Development) : r/pykemains
League of Legends Patch 12.22 Notes - New Items and Drake! - SenpAI.GG
League of Legends Builds by Genetic Algorithm - LoLSolved
What is Self Mitigated Damage in League of Legends?
League of Legends Builds by Genetic Algorithm - LoLSolved
League Damage Calculator APK for Android Download
League of Legends Damage Calculator for all Champs : r/leagueoflegends
Damage calculation or rather armor penetration calculation - General Discussion - Funcom Forums
LoL Mathcrafting - Item Cost vs Damage Reduction : r/leagueoflegends
Steam Workshop::The League of Legends (Rito Games)