If you ever need an IPAM and/or DCIM tool this one is highly recommended. It allows modeling all your infra including network, datacenter and virtualization using a web gui and has an extensive REST API. It can be extended by plugins and "custom fields".
Today it’s widely used and there’s plenty of docs, examples and integrations available.
The tool is build on Python/Django and uses PostgreSQL. LDAP and other auth methods can be configured. Manual installation includes installing required packages, db and http server. Upgrading to latest version is supported. There’s also Ansible playbooks available for deploying (3rd party).
There’s Sites, Racks, Devices, Virtualization, VLAN and Interfaces. VM’s and Devices are seen separately and have their own API calls, which might be something to be aware of.
Devices can be put in racks and have Connections using Cables connecting Interfaces. Same goes for Power, Console, Storage etc.
For IPAM there’s Prefixes, IP’s (4 and 6), VLANs, VRF’s and VC’s.
Can be done in bulk with e.g. CSV or using the API. If you’re migrating from RackTables there’s ‘racktables2netbox’ but be aware it’s not updated and not directly usable in it’s current state (e.g. API’s changed). It uses ‘pynetbox’, a client lib you can also use for own scripts.