VestChain is developing a smart contract platform that will have a double layer architecture. Their network is currently powered by the Ethereum based VEST token.

Phore Blockchain is a Proof of Stake blockchain platform that is designed to enable decentralized transactions for a variety of applications.

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.