[ianmiers]

There are some Zcash forks with iffy dev support and no market traction. The problem is the kind of cryptography you need to do something like Zcash is very very very hard to get right. Zcash actually got the tech right and handled the issues they hit well. They just didn't do a good job with reputation outside of tech.

No one else as done the same tech yet themselves. A few things have launched and allegedly plan to add a privacy layer (Mina, Celo). But actually building that kind of tech is a lot harder than reputation management or standard blockchains.

It's still an open playing field.