SoA Hinagiku
Fate Grand Order 3T Farming
SaberofAvalon Stuff
5* CE Exp Calculator
5* CE Comparison Table
SSR & SR Luck Chance per SQ
Tools
FGO Ember/Materials Calculator
shipfu.moe's Free SQ Calculator
Spreadsheets/Tables
Atlas Academy's Top 5 Nodes
for Materials Dropsheet
Xzero's NA 2019 Event Shop Mats
dprovine & Lyinne's
Interlude/Strengthening Quest Drops
JP Free Nodes Droprate Sheet
NA Upcoming Banners by Servant
based on JP clairvoyance
Noble Phantasms
Ein Inferno's JP NP Damage Table
Infernal1768's NA NP Damage Table
Appmedia NP Time Duration Table
@Wiki's In-Depth NP Damage Table
NA 3T Guides
Hong's Guide to Budget-3T Free Quests
Resources
Cirnopedia (EN)
Gamepress (NA)
Chaldeas Servant DB (NA)
Appmedia (JP)
Kazemai (JP/TW)
FGO @Wiki (JP)
FGO Wicurio (JP)
FGO Fandom Wikia (EN)
Grand Order Wiki (EN)
Communities
FGO /r/grandorder Reddit (EN)
/r/grandorder (Discord)
Atlas Academy (Discord)
NGA Forum (CN)
Gamer.com.tw Forum (TW)
Random Math
Trubo on minimizing QP costs with leveling CEs
Xeo on Golden/Rainbow
Summoning Animations
Kyte on How Damage is Calculated
Kyte & Aedra on Death Chance Math
(direct link to Google spreadsheet)