Relevant with the Crystal 1.0 post earlier today / yesterday. Kemal is a great framework in the spirit of Sinatra, if you don't need all the fancy features of the big frameworks like Amber and Lucky.
I've used it and it's super easy to use, congrats on the 1.0! Oh, and happy birthday!
It is very good news, with the hope that it will continue.
This is really a performance like a lightning mcqueen :)