Wanting to start a discussion about coins people are mining that haven't hit the exchanges yet. Most of the lists I see are dated on this topic. Also, what pool preference and miner is being used.
Yeah, I don't think people will let out their secrets for the simple reason they don't want to get their profits hurt, especially with NH a$$holes that are just going to send a giant chunk of hashing power on the coin. I do spend quite some time searching for coins with potential and low diff and it usually pays off.
2 of the coins I discovered before everyone started mining the shit out of them were SUMO and ETN. I was lucky enough to accumulate several thousands for sumo and tens of thousands for ETN. Then they got listed on WTM and today I would barely mine 10 sumos a day for instance.
So don't take it personally, but do your own research for the coins.
I can tell you I use gateless gate sharp for mining.