Stratis, Waves and Lisk I would say. These coins are bombs ready to explode in years. Their developments are going good but need some more time for sure.
My vote is for WAVES, LTC and LISK. I have mentioned them according to their potential. WAVES will be definitely showing more progress than other two. However, none would be able to surpass Ethereum and it will surely remain number one altcoin like forever.
Those are also good ones, I don't have no LTC yet, I'd like to buy some in next dip, but the others I got them in low volumes. I trust those coins, hold until a good profits come out.