For current blockchain technologies, there are three challenges: measure of value, self-evolving capability, and healthy ecosystem development. Nebulas aims to address those challenges 

•  Nebulas Rank (NR) (§2), which measures value by considering liquidity and propagation of the address. Nebulas Ranking tries to establish a trustful, computable and deterministic measurement approach. With the value ranking system, we will see more and more outstanding applications surfacing on the Nebulas platform. 

•  Nebulas Force (NF) (§3), which supports upgrading core protocols and smart contracts on the chains. It provides self-evolving capabilities to Nebulas system and its applications. With Nebulas Force, developers can build rich applications in fast iterations, and the applications can dynamically adapt to community or market changes. 

•  Developer Incentive Protocol (DIP) (§4), designed to build the blockchain ecosystem in a better way. The Nebulas token incentives will help top developers to create more values in Nebulas. 

•  Proof of Devotion (PoD) Consensus Algorithm (§5). To build a healthy ecosystem, Nebulas proposes three key points for consensus algorithm: speediness, irreversibility and fairness. By adopting the advantages of PoS and PoI, and leveraging NR, PoD will take the lead in consensus algorithms. 

•  Search engine for decentralized applications (§6). Nebulas constructs a search engine for decentralized applications based on Nebulas value ranking. Using this engine, users can easily find desired decentralized applications from the massive market. 

https://nebulas.io/docs/NebulasTechnicalWhitepaper.pdf

Reason's I will be hodling all NAS long term.

• One of the best teams I've ever seen , including founders of neo and ex google engineers.
• Super active github repo
• You can use the test net right now.
• It's a completely new block chain that is already in test net and with main net released in Q1 2018
• There will be a type of master node ( Proof of devotion )
• The smart contracts created on NAS platform are up-gradable unlike Ethereum smart contracts.
• They have an international community and team with offices around the world.
• They have yet to do any major marketing and are hiring more team members right now.
• There twitter growth is already going up
• The team actively updates the community on whats going on.
• Total tokens circulating will be around 40million, at current prices gives it a market cap of 600M, which is incredibly low considering NEO is over 10X.
• They never had an ICO and there pre-sale was so that there would be no future problems with government regulation.