Indie Boost - A video game discovery software used by Publishers, Press, YouTubers, and Streamers.
Isometric Game Art Pack - Extensive library of game art for indie devs
RYSE UP - Connecting up-and-coming artists with the world's top talent
Kandinsky.io - Abstract image generator
Isometric Love - Cute isometric objects for designers
OpenGameArt.org - A site dedicated to sharing artwork & other assets for game development.