Ask HN: What is the best resource out there keeping track of great tools?

Often a friend or a client will ask how to solve a particular business problem and I will have the right tool at their disposal which I have already used and tried. But if I have not been lucky to read about that tool or having used it, I might have not easily been able to offer a solution.

I'd love to find a place which has listed 100+ tools for different problems (marketing, project management, email, cloud storage, invoicing software, you name it) that I can browse and see what problems it solves.

Does anything come to mind? And besides Product Hunt, how do you stay up to date on new tools that can help you at work?