Any Website/Tool To Search Ranked Forums?

Hi Everyone!!, First of all, i´d like to say hello and introduce myself.
My name is Angel and i am fully dedicated to Marketing (Online and Offline) for the last 4 years.
The reason i joined this forum is just to learn and put into practise as much a i can to make my new business growth and make others do if i can contribute with something helpful.

I am starting a new business related to dropshipping and now im doing a niche research.
The thing is that one of the steps i am following is finding Top Ranked Forums where i can read information about the products i am investigating, and what people comments.

Some time ago there were some websites where one could search the Top Ranked Forums Worldwide, all sorted by categories and then visit them. For example:

www.big-boards.com

Now that website no longer exists and the alternative "http://www.thebiggestboards.com/largest-Food-forums/1" doesn´t seem to be very useful.

Do anyone know any website similar to big-boards.com or free or payment tool that i can use for what i need?

I hope someone can give a hand

Thanks in advance