Tome of Monsters Volume 1 by Sonixverse Labs(A FREE 150+ page compendium that provides various templates and variants to many iconic monsters in DnD) : r/UnearthedArcana
Tome of Beasts 2 - ejb128 Flip PDF | AnyFlip
Tome of Beasts – Tessera Guild
Kobold Press (@KoboldPress) / Twitter
Tome of Beasts 2 for 5th Edition - Kobold Press Store
Tome of Beasts for 5th Edition Hardcover - Nord Games