The eight canonical warbands from the Mordheim Rulebook, plus the official Grade 1A add-ons from GW supplements. These are fully supported in the Quartermaster app as built-in warbands (Core 8) and official add-ons.

WarbandSource
Cult of the PossessedMordheim Rulebook
Reikland MercenariesMordheim Rulebook
Middenheim MercenariesMordheim Rulebook
Marienburg MercenariesMordheim Rulebook
Sisters of SigmarMordheim Rulebook
Skaven (Clan Eshin)Mordheim Rulebook
UndeadMordheim Rulebook
Witch HuntersMordheim Rulebook
Beastmen RaidersTown Cryer / GW Supplement
Averlander MercenariesTown Cryer / GW Supplement