[megalottachoc]

I have tried various over the past 20 years and they've been mentioned elsewhere on this thread, but the main two I use are:

The mana world- a 16 bit inspired MMO rpg http://www.themanaworld.org

And EDOPro, a YGOPro fork (You-Gi-Oh client) with improvements

[vanderZwan]

Wow, The Mana World still is actively used? That's pretty cool. Also a weird Baader-Meinhoff moment, I just saw Thorbjørn Lindeijer last weekend at the 40th birthday of a mutual friend, and we briefly talked about when we were still studying together and he, his brother Frode and a few other guys just started that project.

Funny how that project directly lead to Tiled

https://www.mapeditor.org/