Eberron Dragonmark Spell
The book Eberron: Rising from the Last War brought something new with the Dragonmarks: characters how have any of the marks have access to an expanded spell list, if they have levels in a spellcasting class. These spells count as spells of the spellcasting class spells list.
The RPGists D&D 5e Spellcaster Helper now supports this feature. If your create a Wizard character with the race Mark of Healing Halfling, for instance, the spell Cure Wounds will be available to be learned as a wizard spell.
See here the lists of dragonmark spells for each race.