https://esolangs.org/ is a great place to find a ton of esolangs

I like clicking the "Random Page" button and surfing around on it

All those listed here are on there I believe as well as classics like Brainf**k, Malbodge, Piet, etc

Here are some of mine: https://esolangs.org/wiki/User:BlueOkiris

My favorite one remains the Piet.

And also my favorite programs is How to compute Pi in Piet, where result precision depend on the resolution of program image 🤣: https://www.dangermouse.net/esoteric/piet/samples.html