Uncommon 5E D&D Races — Dragonborn – Nerdarchy

The Half-Dragon - 86 subraces, very powerful homebrew race, add to your campaign at your own discretion or run an entire one based of it : r/DnDHomebrew

Children of the Dragon, the sequel to Half Dragon Player Race (see link for full 67 pages work) : r/UnearthedArcana

D&D races and species guide: Which to choose in 5E

Dragonlance Dungeons & Dragons

D&D 5e Dragonborn Barbarian: A Look at the Race and Class - Nerds on Earth

Dungeons and Dragons: 8 Playable Races Outside The Player's Handbook

Dragonlance: Shadow of the Dragon Queen Steel Edition (D&D) – Beadle & Grimm's Pandemonium Warehouse

SRD - Races

The Tiefling Race for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond

Creating characters for your next D&D campaign? Use Ancestry & Culture instead of race - Polygon