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Need to follow their site to see when the next one is up. The blog always has updates https://www.stellar.org/blog/

Not sure what they have planned yet. Of course Byteball will be doing another one in early July. I will make sure I write about it!

Yeah I was introduced to byteball fairly recently and it is awesome. Other than byteball and stellar, are there any other similar things out there?

Nothing that I know of at this stage. But I will be following it closely!

I think potential new coin developers will be following this model closely and more will be on the horizon!