There are many software solutions for managing projects out there. Interestingly you may also find a specific tool designed for the small field of H2020 research projects. I had the chance to test some of them but have to say that the use of specific tools for managing a multi-stakeholder project is not really helpful.
My suggestion is to keep it simple, use Sharepoint for document sharing, keep your shared files organized, make use of templates and checklists. The only exception I would make is for a good web conference solution. there are much better tools out there then Skype for Business.
However, if you really think you need a specialized tool, please find below a list of tools that are still being used in H2020 projects.