Many cloud strategies rely heavily on proprietary platforms and services. There’s no open source equivalent of a public cloud like AWS or Microsoft Azure, for instance, and it is unlikely that major public cloud vendors will open source their own services. However, there is a variety of open source cloud computing platforms, as well as tools, available.
Open source technologies provide more flexibility and less dependence on proprietary platforms, as well as cost savings. With open source, developers can inspect and modify the source code to fit their needs and requirements.