Inven Global partners with LoL stats platform LoLvvv - Inven Global
Full champion Pick & Ban Stats for Worlds - GameSpot
OP.GG Bot for Discord
I use Murderbridge to check for niche items/runes on certain champs, and find this on almost all AD/ADC champs. Truly good or just weird stats? : r/ARAM
Baron - HellHades - Raid Shadow Legends
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) :
Champion FO Build Complete Guide (Stat, Skill, Rune. & Equips) Ragnarok Mobile Eternal Love by Dievs - YouTube
League of Legends Stats, Build, and Counters
Surrender at 20: Mokulu's Champion Build Simulator