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 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.

The Oslo configuration API supports parsing command line arguments and .ini style configuration files.

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).

Python makes loading code dynamically easy, allowing you to configure and extend your application by discovering and loading extensions ("plugins") at runtime. Many applications implement their own library for doing this, using __import__ or importlib. Stevedore avoids creating yet another extension mechanism by building on top of setuptools entry points. The code for managing entry points tends to be repetitive, though, so stevedore provides manager classes for implementing common patterns for using dynamically loaded extensions.

The OpenStack Service Types Authority contains information about officiag OpenStack services and their historical service-type aliases. The data is in JSON and the latest data should always be used. This simple library exists to allow for easy consumption of the data, along with a built-in version of the data to use in case network access is for some reason not possible and local caching of the fetched data.

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

The oslo.serialization library provides support for representing objects in transmittable and storable formats, such as JSON and MessagePack.

The Oslo Concurrency Library provides utilities for safely running multi-thread, multi-process applications using locking mechanisms and for running external processes.

This package provides a client library for building applications to work with OpenStack clouds. The SDK aims to provide a consistent and complete set of interactions with OpenStack’s many services, along with complete documentation, examples, and tools.

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

Python-keystoneclient is the identity service used by OpenStack for authentication (authN) and high-level authorization (authZ). It currently supports token-based authN with user/service authZ, and is scalable to support OAuth, SAML, and OpenID in future versions. Out of the box, Keystone uses SQLite for its identity store database, with the option to connect to external LDAP.

The oslo.utils library provides support for common utility type functions, such as encoding, exception handling, string manipulation, and time handling.

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.

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

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 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.

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

GNU Guix is a functional package manager for the GNU system, and is also a distribution thereof. It includes a virtual machine image. Besides the usual package management features, it also supports transactional upgrades and roll-backs, per-user profiles, and much more. It is based on the Nix package manager.