Common - Spoken by humans, gnomes, and most everyone else in the industrialized world
Dwarvish - Spoken by dwarves, but rarely by anyone else
Elvish - Spoken by elves, but carries a negative stigma due to its relation to ancient magic
Giant - Spoken by large folk such as giants and ogres
Gnomish - Spoken by gnomes, but it less so now that Common is the primary language
Goblin - Spoken by goblins and orcs
Halfling - Spoken by halflings, but less so now that they have integrated with larger societies
Orc - Spoken by orcs and goblins
Semaphore - Communicated through flags, used by naval crews, telegraph workers, and soldiers
Ditdot - Communicated through short and long signals, used by daeryd, and now by navies, telegraph workers, and soldiers as well
Hellish - Harsh and unholy, spoken by demons and devils
Celestial - Beautiful and holy, spoken by divine creatures and by high-ranking clerics or paladins.
Draconic - Dead language spoken by dragons
Infernal - Harsh and unholy, spoken by devils
Sylvan - Spoken by magical animals, living plants, and the fey
Undercommon - spoken by denizens of the Underworld