Hi, thanks for your question.
https://github.com/oroinc/platform – OroPlatform (Business Application Platform) is built based
on Symfony framework. And roughly speaking it greatly expands functionality to make development of custom business applications easier and faster, offers unlimited flexibility and a lot of features out of the box.
We can consider it as the basis and starting point for building any other applications. Whether it’s a CMS system, an internet store, etc.
Actually, OroPlatform is a composer package that requires an application to initialize and run it. https://github.com/oroinc/platform-application is an example of such application which simplifies initial project setup and configuration.
https://github.com/oroinc/crm – OroCRM is Client Relationship Management which is actually build on OroPlatform. Is its logical transformation into a system created to satisfy all the requirements of CRM system. In other words it is fully functional solution, with a huge number of features that right now can be used in business processes.
OroCRM is a composer package that requires an application to initialize and run it. https://github.com/oroinc/crm-application is an example of such application which simplifies initial project setup and configuration.
So the right choice for you is https://github.com/oroinc/crm-application. Please follow instruction from repository Readme file.
If you have any questions about the installation or customisation, do not hesitate to ask them, we will be happy to help.