Most of the time you need one framework (to give a best practice structure to your project) and many additional libraries to add functionality. So it should be

Most of the time you need one framework (to give a best practice structure to your project) and many additional libraries to add functionality. So it should be obvious that the number of frameworks this world needs is quite a bit lower than the number of libraries. In addition, you are always free to go with your own implementation and that is true for the structure dictating frameworks as well as for the libraries.