The cliff framework allows creating multi-level commands such as those of subversion and git, where the main program handles some basic argument parsing and then invokes a sub-command to do the work. It uses plugins to define sub-commands, output formatters, and other extensions.

The oslo.i18n library contain utilities for working with internationalization (i18n) features, especially translation for text strings in an application or library.

OpenStack Object Storage (code-named Swift) creates redundant, scalable object storage using clusters of standardized servers to store petabytes of accessible data. It is not a file system or real-time data storage system, but rather a long-term storage system for a more permanent type of static data that can be retrieved, leveraged, and then updated if necessary. Primary examples of data that best fit this type of storage model are virtual machine images, photo storage, email storage and backup archiving. Having no central "brain" or master point of control provides greater scalability, redundancy and permanence.

The oslo.log (logging) configuration library provides standardized configuration for all OpenStack projects. It also provides custom formatters, handlers and support for context specific logging (like resource id’s etc).

The Oslo Test framework provides common fixtures, support for debugging, and better support for mocking results.

Keystoneauth provides a standard way to do authentication and service requests within the OpenStack ecosystem. It is designed for use in conjunction with the existing OpenStack clients and for simplifying the process of writing new clients.

The Oslo Test framework provides common fixtures, support for debugging, and better support for mocking results.

Reno is a tool for storing release notes in a git repository and building documentation from them.

Os-testr provides developers with a testr wrapper and an output filter for subunit.

The Oslo context library has helpers to maintain useful information about a request context. The request context is usually populated in the WSGI pipeline and used by various modules such as logging.

Orange Widget Base provides a base widget component for a interactive GUI based workflow. It is primarily used in the Orange framework.

This package provides an utility that accesses files on a HTTP server and stores them locally for reuse. It is primarily used by the Orange framework.

Orange is a component-based, graphical framework for machine learning, data analysis, data mining and data visualization.

Orange Canvas Core is a framework for building graphical user interfaces for editing workflows. It is a component used to build the Orange Canvas data-mining application.

Orpheus is a light-weight text mode menu- and window-driven audio player application for CDs, internet stream broadcasts, and files in MP3 and Vorbis OGG format.

The Open Text Summarizer is a library and command-line tool for summarizing texts. The program reads a text and decides which sentences are important and which are not. OTS will create a short summary or will highlight the main ideas in the text.

The program can either print the summarized text as plain text or HTML. If in HTML, the important sentences are highlighted.

The program is multi lingual and works with UTF-8 encoding.

oyacc is a portable version of the OpenBSD's yacc program, with no dependencies besides libc.

The SVG files in this directory are intended to be used as backgrounds for different components of the GNU system like login managers and desktop environments. The backgrounds are available in different aspect ratios which are indicated in the file name.

Conan is a package manager for C and C++ developers that boasts the following features:

• It is fully decentralized. Users can host their packages on their own private servers.

• It can create, upload and download binaries for any configuration and platform, including cross-compiled ones.

• It integrates with any build system, including CMake, Makefiles, Meson, etc.

• It is extensible; its Python-based recipes, together with extensions points allow for great power and flexibility.

Conda is a cross-platform, Python-agnostic binary package manager. It is the package manager used by Anaconda installations, but it may be used for other systems as well. Conda makes environments first-class citizens, making it easy to create independent environments even for C libraries. Conda is written entirely in Python.

This package provides a PackageKit frontend for GNOME. PackageKit is a common unified interface for package managers.

Guix-Jupyter is a Jupyter kernel. It allows you to annotate notebooks with information about their software dependencies, such that code is executed in the right software environment. Guix-Jupyter spawns the actual kernels such as python-ipykernel on behalf of the notebook user and runs them in an isolated environment, in separate namespaces.

Guix-Modules is an extension of Guix that provides a new guix module command. The guix module create sub-command creates environment modules, allowing you to manipulate software environments with the module command commonly found on HPC clusters.

The RPM Package Manager (RPM) is a command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating computer software packages. Each software package consists of an archive of files along with information about the package like its version, a description. There is also a library permitting developers to manage such transactions from C or Python.