Saying GPT-3 is cheating :)
Mine is stable diffusion. It's made making graphics so much easier. I'll admit midjourney is easier to use, but stable diffusion is more versatile.
In fact, it's so versatile I made an API for it:
https://evoke-app.com/, it'sbe great for devs making AI apps.
What's your fav non-ChatGPT AI tool?
Style My Ride
Microlaunch
Evoke