Game Development

Game Engines
Godot (free opensource)
Unreal
Game Maker
RPG Maker

News
Game Developer.com

Graphics (GFX)
Gimp
Blender (3D)
Krita (Pixelart)
Inkscape (Drawing)

Sound Assets
Freesound.org

Asset Stores:
Gamedevmarket
Craftpix
Artstation
Itch.io
Syntystore
Unreal Marketplace
Unity Assetstore