1 - Verge or XVG
Verge is definitely a good long-term hold. The wraith protocol is awesome and will be released soon.
Privacy + fast transaction + small fees, isn't that what Satoshi Nakamoto wanted to achieve?
Xvg is highly anticipated to get 1$ very soon!
2- Ripple or xrp
Ripple is actually a technology that has a dual function; as a digital currency as well as a digital payment network for financial transactions.
The way it works is that the Gateway functions as a credit intermediary that receives and sends currencies to public addresses over the Ripple network. This is why Ripple is less popular when compared to the other digital currencies, with only a $1 value to date.
3- Lisk or LSK
you should definitely consider investing in it. Considering the huge range of applications LSK has, it doesn’t really matter what industry you are in — it could be a game changer for you. To start, all you need is a platform that acknowledges this altcoin.
4- Cardano or ADA
First blockchain to be developed from a scientific philosophy:
Regulatory and Compliance focus
Scaleability
Cross Chain integration
Cardano aims to integrate with all other major cryptocurrencies without the use of a third party, which:
1. Reduces fees that exchanges charge
2. Allow quicker and easier transactions across the blockchain
3. Removes risk of a third party losing your cryptocurrencies
5- NEM or XEM
is most similar to Ethereum in what it's attempting to accomplish. Through the implementation of mosaics and Namespaces, NEM is able to create tokens like Colored Coins in the Ethereum blockchain.
Source:
Best 5 Altcoins That Will Outperform Bitcoin In 2018