Metadium is developing a blockchain protocol for Self-Sovereign Identity. Their goal is to allow users to own all aspects of their identity. Metadium's network is powered by the Ethereum-based META token.

BaaSid, short for Blockchain as a Service for ID, is a blockchain based network for securing personal authentication data. BaaSid divides and redistributes data related to personal information on a blockchain and does not rely on a centralized database to store this sensitive information. The network is powered by the Ethereum-based BAAS token.

The Sovrin Foundation is a non-profit organization dedicated to establishing the Sovrin network. Their goal is to create a purpose-built blockchahin, with a native token, that will facilitate creating and maintaining self-sovereign identities. The Sovrin token will provide incentives to value exchange that preserves privacy. It could also enable a global marketplace for digital credentials and personal data.
This is an important project that has lofty goals, but has the potential to revolutionize several major industries.