Gulden NLG is the very definition of a hidden gem. the devs dont come on bitcointalk at all and are developing their own community and introducing thousands of new people to crypto. And theyre doig it with the easiest to use tech and the most merchants where you can actually spend your coins. Even if you don't buy try the wallets and youll see that they are the best.

They are also just about to drop teh next generation of blockchain tech on the world. Segsig and POW2. They already have the most merchants, a fiat exchange with another coming online soon and a community that is growing exponentially.