RGL is a framework for graph data structures and algorithms.

BDD for Ruby.

RSpec extension gem for attribute matching.

RuboCop is a Ruby code style checking and code formatting tool.
It aims to enforce the community-driven Ruby Style Guide.

RuboCop's Node and NodePattern classes.

Ruby/NTLM provides message creator and parser for the NTLM authentication.

Module Stream defines an interface for external iterators.

vagrant-spec is a both a specification of how Vagrant and its various
components should behave as well as a library of testing helpers that let you
write your own unit and acceptance tests for Vagrant.

The library provides a set of helper methods in addition to RSpec matchers and
expectations to help you both unit test and acceptance test Vagrant
components. The RSpec components are built on top of the helper methods so
that the test library can be used with your test framework of choice, but the
entire tool is geared very heavily towards RSpec.

Ruby library for the HashiCorp Vagrant Cloud API

WEBrick is an HTTP server toolkit that can be configured as an HTTPS server, a
proxy server, and a virtual-host server.

Ruby library for Windows Remote Management.

Ruby library for file system operations via Windows Remote Management.

YARD is a documentation generation tool for the Ruby programming language.
It enables the user to generate consistent, usable documentation that can be
exported to a number of formats very easily, and also supports extending for
custom Ruby constructs such as custom class level definitions.

Authoritative dns server for A/AAAA container records. Forwards other request to host's /etc/resolv.conf

Buildah provides a command line tool which can be used to:
- Create a working container, either from scratch or using an image as a starting point
- Create an image, either from a working container or via the instructions in a Dockerfile
- Build images in either the OCI image format or the traditional upstream docker image format
- Mount a working container's root filesystem for manipulation
- Unmount a working container's root filesystem
- Update the contents of a container's root filesystem
- Delete a working container or an image

Conmon is a monitoring program and communication tool between a
container manager (like podman or CRI-O) and an OCI runtime (like
runc or crun) for a single container.