Comment by petercooper

I run RubyFlow and it's just a community link posting site for Rubyists, so feel free to update this to the URL of the actual project if you wish: https://github.com/vidarh/rubywm/tree/master .. RubyFlow runs on a teeny tiny Heroku instance so may not be too great at handling your traffic. It's about fifteen years old though and a single Ruby file, so I should probably rewrite it! ;-)