Netdisco is written in Perl and self-contained apart from the PostgreSQL database, so is very easy to install and runs well on any linux or unix system. We also have docker images if you prefer.
It includes a lightweight web server for the interface, a backend daemon to gather data from your network, and a command line interface for troubleshooting. There is a simple configuration file in YAML format.
Please check out the installation instructions on CPAN.
Some of the things you can do with Netdisco: