While public cloud providers like AWS offer an unparalleled amount of services and options there are often good reasons for in-house infrastructure as well. And there are quite a few open source options available that will deliver a very robust and feature rich private cloud. Each of those vary in complexity and the best option varies per organization. We would recommend to also include the following 4 products in your evaluation of available options:
Of course we can assist with gathering requirements, evaluating options, procurement, installation and ongoing management of your private cloud.