The Opnsense Resource Provider lets you manage opnsense resources.
Upstream terraform provider: https://registry.terraform.io/providers/gxben/opnsense/latest Template: https://github.com/tmeckel/pulumi-tf-provider-cookiecutter
This package is available only for .NET currently.
To use from .NET, download the .nupkg file, put it into a folder, modify your Nuget.config to include that folder as apackage source. Then you should be able to install using dotnet add package:
dotnet add package Pulumiverse.Opnsense