issue/bug management, project management, people management, product management all in one, preferably open source software ?

Hi people

I'd like to know if people here know of or use any integrated solution 
for all or some of the above. It would be nice if it supported LDAP / 
OAuth 2.0 , integrate with plain vanilla git (not github / gitlab) and 
be open, and active as a project.

We are at a phase our business is expanding, the projects also are 
increasing in number and size, several of those are interconnected, 
either depending or prerequisite or even inter-meshed .

I'd like to have a tool to manage all this, but also a tool to show to 
the stakeholders the actual picture of our system.

I'd be grateful for any hints !