[sime]

It's pretty good for brainstorming ideas and it can generate a mindmap in markdown format that you can visualise in tools such as Markmap. E.g. with a prompt like this (works best in v4):

"I'm brainstorming a business venture that is a cross between a boutique clothing store and DIY sewing classes. It’s called Style & Stitch. You can shop for clothes and learn to make your own. Please help me brainstorm some ideas for as a mind map (using Markmap markdown)."

You can ask it to combine ideas from different domains together for extra creativity (above example is output of one such attempt). Often it's not that creative on first attempt but if you prompt it with something like "how about some zanier ideas" it will do better.

I also like to prompt it with "output XYZ .. as a table with columns for X, Y, Z" or similar to get a nice markdown table of its output where it makes sense.