We're selling Koken (medium.com)

It's such a nice tool with such huge potential. I've used it to build a personal image showcase for family for awhile, and shared it with anyone seeking a similar technical solution. I hope it's scooped up by someone that has a vision for what it can become.

  > Borrowing its name from ancient stagehands in traditional Japanese theater

I would have guessed its name was a play on Cokin, the photography filter company.