Namecoin is a blockchain-based DNS that allows users to register domain names with a ".bit" domain. Namecoin was the first fork of the Bitcoin protocol and it aims to remove centralized control over domain registration. It was the first cryptocurrency to use Auxiliary Proof of Work (AuxPoW) as a consensus mechanism,
where a child blockchain is dependent on the Proof-of-Work consensus of the parent blockchain. This allows for Namecoin and Bitcoin to be mined simultaneously, and when a new block is created on Bitcoin, it will also be added to the Namecoin blockchain.
Namecoin is a very important project that represents one of the best use cases of blockchain technology in protecting free speech and resisting censorship on the internet. It is powered by the NMC coin. The decentralized DNS provides more security from hackers and government intervention.

Nebulas is an innovative project that aims to be the first blockchain search engine. It has been called the “Google for Blockchains." They want to build a self-evolving blockchain system that is based on incentives and will also provide a development infrastructure. The company developed two concepts to achieve their goal: Rank and Force. Similar to Google's PageRank, Nebulas Rank will be a measure of overall value for blockchains. While Nebulas Force, will be a solution that will support smart contracts, and will be able to adapt to market demands. This will prevent forking from occurring because new technologies can be incorporated and bugs can be fixed without changing the underlying code. The development system will provide all of the essential tools needed to create distributed applications. One of the key components of the platform is the incentive structure that has a Developer Incentive Protocol (DIP) and a Proof of Devotion (PoD) protocol that will reward users with Nebulas tokens to create quality applications. Nebulas was created by Hitters Xu, who is also the founder of NEO, and is an important figure in the Chinese blockchain community.

Blockstream is a private, for profit, blockchain technology company, that has played a key role in helping to develop, and fund, many of the key features of the Bitcoin Core platform. Blockstream is focused on developing bitcoin applications and has raised significant funding from several large investment funds. The company also employs several developers that are very influential within the Bitcoin Core development project. This, as well as being of Bitcoin's largest donors, has led to some criticism about conflicts of interest.
Blockstream is developing a number of Bitcoin applications that are intended to encourage adoption and improve transaction times on the bitcoin network. Their primary focus is on Sidechains, which are are extensions to existing blockchains that improve their functionality. The company is also working closely with industry leaders to create the Bitcoin Lightning system that will support higher trading volume and faster transactions on the bitcoin network. Blockstream is also developing a data feed, satellite network, and other applications that they hope will make blockchain more accessible.