Page builder plugins are now commonplace and there are many options available, both free and premium.
I have released a free and open source page builder called Tailor which addresses what some consider to be a worrying trend: incredibly complex builders (and as a result themes) that end up overwhelming end users. It does this by providing a simple, intuitive drag and drop user interface (which is recognisably WordPress) along with the ability to easily extend it with your own plugins and themes. It intentionally leaves as much of the design to the theme as possible, so websites don’t all end up looking the same and theme developers don’t have trouble providing their own look and feel.
If anyone has worked with page builders in the past (or intends to in the future), I’d love to get your thoughts on Tailor. Below are some links that may interest you:
For those who are fundamentally opposed to this type of plugin, I apologise for introducing more evil into the world