Here's a list of other Gen IV reactor companies/projects (from Thorium Remix 2016):

Terrestrial Energy, Flibe Energy, Molten Energy, Transatomic, ThorCon Power, Copenhagen Atomics, Seaborg, Chinese Academy Of Sciences.

I uprooted unique_parrot2's comment, as it reflected my view about nuclear power, up until last year. Here is the documentary that changed my mind: http://pandoraspromise.com