What are the best worldbuilding tools you currently use?

For visualization (I hesitate to call it art) I use FOSS programs like InkScape, Blender, and Krita. I was using Obsidian extensively for notetaking and conlanging, but especially with Conlangs where I use one note per lexeme, it can get bogged down when you have hundreds of notes stored remotely.

I'm currently exploring TiddlyWiki as it's much more shareable online. I have several on my neocities page. I also have a (private/self hosted) mediawiki server running, mostly as a personal ego boost so I can say I have a "real" wiki.