How do you discover AI tools by category?

Lately I’ve found it easier to explore AI tools by category instead of chasing “best tool” lists. I’ve been using AI Skynet Tools

mainly to browse what exists across areas like writing, agents, research, and productivity, without digging into heavy reviews.

It’s not about finding one perfect tool, just understanding the options. Curious how others here usually discover new AI tools — directories, Reddit threads, Twitter, or recommendations from friends?