The TTRPG Creator Resource Masterpost lists resources from Creative Commons stock resources to paid elements that can be used in commercial works. It contains everything from tabletop systems to music and video.

An ancient and wide knowledge pool about playing tabletop RPGs in the form of a blog.

Monthly discoveries for tabletop roleplaying game designers. Vetted. Looted. Curated.

Over 1400 name generators, as well as many description generators, guides, and various tools.

A long-standing and extremely helpful site for tabletop RPG Game Masters. Provides weekly articles, tips, tools, and advice GMs, alongside books, podcasts, and videos.