I read on wikipedia that cloud foundry open source software is available to anyone whereas the Pivotal Web Services is a commercial product from Pivotal.
I kinda searched a lot on internet but did not find any cloud foundry open source software implementation example. Everything is for Pivotal product which provides a 2 months free trial service.
So can anyone tell me what is the cloud foundry open source software? And what exactly is the difference between cloud foundry OSS & Pivotal CF?
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To add to the above answer, Pivotal Cloud Foundry offers a public cloud offering called Pivotal Web Services where you can signup and deploy your apps on the cloud which is hosted by Pivotal.
On the other hand they also allow enterprises to host private cloud environment by installing components of the cloud infrastructure on VMWare VSphere, AWS, OpenStack Check this(http://docs.pivotal.io/pivotalcf/installing/pcf-docs.html) link out.
Cloud Foundry is open source software, but if you are looking to tinker with it for the first time, using the OSS is a bit involved. You will need to have a provisioned cloud environment, you will install it yourself using MicroBosh, and everything will be done through the command line.
Pivotal Cloud Foundry is a commercial implementation that makes it easier to get up and running as you are learning the project. It provides a hosted environment in Pivotal Web Services so that you don't have to install it yourself, a web interface that makes managing the environment easier, and a number of pre-provisioned services including relational databases and messaging queues. This is the best starting point if you are just learning the technology.