OpenStack is a set of software tools for building and managing cloud computing platforms for public and private clouds. OpenStack lets users deploy virtual machines and other instances that handle different tasks for managing a cloud environment on the fly. It makes horizontal scaling easy, which means that tasks that benefit from running concurrently can easily serve more or fewer users on the fly by just spinning up more instances. OpenStack is open source software, which means that anyone who chooses to can access the source code, make any changes or modifications they need, and freely share these changes back out to the community at large.
Cloud Foundry is an open source cloud platform as a service (PaaS) on which developers can build, deploy, run and scale applications. VMware originally created Cloud Foundry, and it is now part of Pivotal Software, whose parent company is Dell Technologies. Developers choose Cloud Foundry for its free, open source nature and for the ability to use their own tools and code. Organizations can deploy Cloud Foundry PaaS on their own internal infrastructure; on cloud providers’ infrastructure, such as Amazon Web Services (AWS) or OpenStack; or on Cloud Foundry-certified platforms, including IBM Bluemix Cloud Foundry, Pivotal Cloud Foundry, SAP Cloud Platform, Huawei FusionStage and Swisscom Application Cloud.