Tool for discovery, drowing and devices management (300 dev)

Hi everyone,

I'm looking for a tool all-in-one that would help me with discovery switches over LAN, paint picture of infrastructure with uplinks/downlinks and would manage devices, adding VLANs or configuring interfaces.

Client has 300 devices mainly Cisco, ECI, Siemens.

Does anyone has some experience in this area and can advise?