Ratpack, Graffiti, Gaelyk, Portofino. It's hard to judge something as "mature" because this is often synonymous with bloated, filled with magic, etc. So for my

Ratpack, Graffiti, Gaelyk, Portofino. It's hard to judge something as "mature" because this is often synonymous with bloated, filled with magic, etc. So for my money, lightweight frameworks like Sinatra for Ruby are more mature that Rails. Most languages have frameworks inspired by Sinatra, or in Python, frameworks that preceded the whole Rails and framework hypestorm.