Chromia is a relational blockchain platform that is designed to be both a blockchain and a relational database. Chromia was created by a Swedish development company called ChromaWay, with the intention of combining the advantages of a blockchain's transparency with the benefits of a relational database system, such as data independence and reduced redundancy.

XMax is creating a developer ecosystem for entertainment DApps. Their entertainment-focused blockchain ecosystem will enable multiple functional sidechains, and will provide a SDK which will make it easier to develop decentralized applications. XMax will also offer a variety of multimedia libraries. The XMax blockchain will have a VRF (Verifiable Random Function) consensus mechanism that will randomly select network users to participate in the verifying transactions.

Ignis is a blockchain platform that is being developed by Jeluirda; the company behind Ardor and Nxt. Ignis is a child chain of the Nxt blockchain. Jelurida is developing blockchain platforms that will enable users to develop decentralized applications, and will be based on a parent and child chain architecture.
Ignis allows users to create child chains with specific features and to create tokens that meet their needs. This project is closely related to Ardor and Nxt.