One of the best most underrated projects by far is Feathercoin!
Old school like DOGE, but has a better in everyway development keeping it more advanced then Litecoin etc.
Way less coin the DOGE and on a decent exchange., only a slight increase in volume would send it too the moon. A few years back it went from something like 400 sats to 26000 sats.
Currently crazy low at 100 Sats or under at times. Though in everyway more advanced then when it was many years ago a Top 5 coin.
IMO should be a many Dollar coin if you compare it verse other crypto, whats it now like 5c.
Good thing though no matter wha its price has been it still always had an active development team so obviously they are not in it for the pump and dump type scam 98% of coins over crypto have been.
If they can hang on at 5cent and develop it to be one of the most (if not the most) uptodate avanced old school coin, you know its been todate a survivor!
Anyway put it on your research list!