Cashu is custodial.

Fedimint is federated.

No idea what elements is tbh.

Liquid is federated and not open source.

Rootstock is federated but at least the fees go to bitcoin miners.

Drivechain is trustless and all fees go to bitcoin miners. You get to have Monero type privacy as well. And you can get simple scalability to 8 billion people using self-custodial.