Ruby is without any doubt, one of the most popular object oriented programming languages out there. It is loved by developers all around the world specially because it's not only powerful but has a sweet simple syntax with lot of great features.
There are quite a number of frameworks developed for Ruby over the years. These frameworks help a developer to accelerate the web development and create innovative web applications with a little effort.
I have mentioned a curated list of all the popular open-source ruby frameworks which are actively maintained. Some of those frameworks might not be as huge & feature rich as others but they work really well for a particular set of requirements.