First off, please don't take anything I say seriously or as financial advice. As always, this is on an opinion based basis. That being said, the 7 cryptocurrencies that are altcoins (that I believe are covering a wide variety of sectors) that I think has some strong technological aspects, are what I will be talking about here. For avoidance of conflict of interest, I am not directly associated with the development of any of these. That being said, the 7 altcoins I am bullish on include: ChainLink, Cosmos, Siacoin, Waves, BitTorrent, Pivx, and Peercoin. ChainLink has a really developer friendly smart contract platform, and Cosmos has consensus protocols, and the ability to easily create side-chains. Siacoin has its proof of storage concept. Waves is a next generation decentralized application development platform with its own exchange. BitTorrent I like more as a startup rather than a crypto, but I am betting long on their technologies. Pivx reminds me of a staked variation of Dash. Peercoin is PoW compatible while having PoS for the network security. Peercoin easily can have more real world adaption. If I would be bullish just on the basis of technological aspects, I feel like these 7 altcoins would be on the list.