Resources:
Batwiki Unofficial BatMUD wikipedia
Information Shoppe Monsters, Items, Eq, Reincs
Dryad's old information page
Hair's Quest information page and more
Batmudder maintained by Ganvar

Maps:
Jeskko's Maps BatMUD maps Google-style
Pupunen BatMUD maps Continents, Areas, Cities
Ooga's mega old Maps Raw maps

Scripts, Triggers, etc.:
Era's Batclient triggers and more
GgrTF TinyFugue triggers