ETHEREUM :-
Etherium is probably the best cryptocurrency available at the moment . The distinguishing factor of Etherium is the "Smart Contract". Many Investors think that Ethereum is still an undervalued currency and can sky rocket any time.Ethereum is estimated to be around $5000 by 2025 (current value - $345.03 as of 28th August ,2017)
N.E.M (XEM) :-
NEM has a huge potential and can sky rocket any time due to the integration with "bankera"(For those who doesn't know what bankera is ,It is the world's first crypto-bank ) (current value - $0.281993 )
Digital Note (XDN) :-
This is another cryptocurrency that I have found and it is pretty cheap at the moment.It does not have any fancy features to compete with the already established giants , But it is a good investment for short term as its undervalued at the moment (current value - $0.002535)