Meanwhile Back in the Dungeon Retro art blog, from various sources.

Angry GM Great GM Resource.

Man Shorts Hilarious sketch shorts about absurdly themed RPG sessions

Fear the Boot An excellent podcast about real RPG issues.

Matthew Colville (YouTube) In my opinion the best authority on RPG gaming.

DUNGEONS & DRAGONS

5e Magic Shop mercenary costs, and more!

BATTLETECH

Battetech Map of the Inner Sphere

Battletech Wiki

TRAVELLER

Traveller Star Map