If you've been around the Symfony community for some time so I think you have used the SensioGeneratorBundle. It's a popular bundle that provides console commands to generate boilerplate code, like controllers and entities. It also includes a basic CRUD generator.
Given that SensioGeneratorBundle is starting to show its age and considering the massive simplifications introduced by Symfony 4, they decided to stop evolving that bundle and they've created a new bundle called SymfonyMakerBundle.
SymfonyMakerBundle helps you creating empty commands, controllers, form classes, tests and more so you can forget about the required boilerplate code. It's an alternative to SensioGeneratorBundle for modern Symfony applications and requires using Symfony 3.4 or newer and Symfony Flex.
Of course the end goal is to not have boilerplate code at all in Symfony applications. Symfony 4 made a lot of improvements towards that goal, but you will always have to bootstrap some code, so having a modern, simple and lightweight bundle to do that is nice.
Generating Code with Makers
The usage of the bundle is similar to SensioGeneratorBundle, but the commands now use the make: prefix instead of generate: In this bundle you can find few commands as below:
php bin/console list make