D&D 5e SRD & OGL (PDF)
5e D&D Ravenloft Player’s Guide
5th edition resources (Going Last blog)
5e Sword Coast hex map (My Realms blog)
Mike Schley’s official 5e maps (Mike Schley website)
The great list of 5e adventures (Merric’s Musings blog)
5e free legal PDF listing (on Reddit)
Collected 5e homebrew Index (The Three Hs of Gaming blog)
Converting old TSR modules to 5e (Classic Modules Today blog)