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

The Case for Half-Dragons as a Playable D&D Race – Nerdarchy

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

Blue Half-Dragons, Race/Species, Dungeons & Dragons 5e, Statblocks & Sheets

Dragontortleborn, an Original Race for D&D 5e - Dungeon Masters Guild

The Ardling: One D&D's Newest Race Explained

DnD Bugbear 5e race guide

Playable DnD Races In The Grey Dragon World 5e

Deep Dive - The Dragonborn — Dump Stat Adventures