Sharepoint Replacement

Alright, I’ve looked and looked and looked for User Roles/Permissions Plugin’s and haven’t found one that works. So I’m reaching out. Essentially what I’m looking to do is similar functions as Sharepoint.

When a user logs in, if the user has the correct permissions: they will be able to navigate to a page that they are authorized to use. Alternatively, I am using Sprout Invoices, and I would like them to see their invoices, and in detail: this should be done using mySQL, which isn’t a problem, just like it to be simplified.

Using groups to define what they see would be awesome as well such as calendars and what not. Note: this would be a feature that I would like everyone to see the page, just not the content.

I do have other things specifically I’d like to do, but are umbrella’ed by the above.

As I’ve said, I’ve looked and looked and looked, and can’t find anything. So any help or suggestions is appreciated.