Every time someone finds ways to develop their development process easily with tools to support development, I think I love Composer, it shows the level of maturity of development I want. Application libraries and scripts are very easy to use.
The number of libraries available in Packagist. is amazing. All of these can be included in the plugin Composer. Packagist is a large composer archive. Basically, it collects all kinds of PHP packages that can be installed by the Composer. On the other hand, Composer handles dependency management that works together with applications.