NXT is an older version of Ardor, but it still alive and share common solutions. "Nxt is an open source blockchain platform and the first to rely entirely on a proof-of-stake consensus protocol. Launched in November 2013 and written from scratch in Java, Nxt is proof that blockchain technology is not only about simple transfer of value but also has the potential to revolutionize many aspects of our lives with the various decentralized applications that can be built with it. :
Links to Ardor client (Full node or thin wallet) downloads: Installer for MacOS, Installer for Windows, Installer for Unix, Universal Zip Package, Android Full Node.
Instructions for download and run NXT client on Linux, Windows, Android, RaspberryPi. "Ardor is a blockchain-as-a-service multi-chain platform that evolved from the time-tested and energy-efficient Nxt blockchain. The Ardor mainnet launched on 01 January 2018. Through this documentation, you will learn all about the extensive capabilities of the Ardor platform. Begin developing your knowledge by reading about each of Ardor's distinctive Features or consider trying the technology yourself by following some Basic Tutorials. For developers, documentation is provided for each of Ardor's more than 250 APIs that can be used to quickly and cost-effectively deploy dApps and smart contracts that integrate your business processes with the Ardor blockchain. Check this site regularly for new content and updates as additional features are released."
True Java based PoS blockchain. Decentralized and fast, crafted by Switzerland based company. Run node even on Your TV Box. "Ardor is a multichain blockchain platform with a unique parent - child chain architecture. The security of the whole network is provided by the parent Ardor chain while the interoperable child chains have all the rich functionality. This elegant design and access to hybrid user permissioning capabilities are the key to the flexibility necessary for a variety of use cases and opens the door towards mainstream adoption of blockchain technology."