Zope Component Architecture

https://pypi.org/project/zope.component/

Zope Configuration Markup Language (ZCML)

https://pypi.org/project/zope.configuration/

Very basic event publishing system

https://pypi.org/project/zope.event/

Message Identifiers for internationalization

https://pypi.org/project/zope.i18nmessageid/

Interfaces for Python

https://pypi.org/project/zope.interface/

Zope Interface extension for defining data schemas

https://pypi.org/project/zope.schema/

Zopfli module for python

https://github.com/fonttools/py-zopfli

Py3c helps you port C extensions to Python 3

https://github.com/encukou/py3c

Seamless interoperability between C++11 and Python (cmake part)

https://pybind11.readthedocs.io/en/stable/ https://github.com/pybind/pybind11

Pybind11 bindings for the Abseil C++ Common Libraries

https://github.com/pybind/pybind11_abseil

Pybind11 bindings for Google's Protocol Buffers

https://github.com/pybind/pybind11_protobuf

Very basic wrapper for libcanberra

https://github.com/totdb/pycanberra

Common files for the Python bindings for the D-BUS messaging system

https://dbus.freedesktop.org/doc/dbus-python/

Common files for Python bindings for GObject Introspection

https://pygobject.gnome.org/

Analyzes python source code looking for bugs and signs of poor quality

https://www.pylint.org/

"meta-port" for the default version of Python interpreter

https://www.python.org/

"meta-port" for version 2 of the Python interpreter

https://www.python.org/

Interpreted object-oriented programming language

https://www.python.org/

"meta-port" for version 3 of the Python interpreter

https://www.python.org/

Interpreted object-oriented programming language

https://www.python.org/

Interpreted object-oriented programming language (beta version)

https://www.python.org/

Interpreted object-oriented programming language

https://www.python.org/

Interpreted object-oriented programming language

https://www.python.org/

Interpreted object-oriented programming language

https://www.python.org/

Collaborative, networked system to detect and block spam

https://github.com/SpamExperts/pyzor

Chinese PinYin and Bopomofo conversion library

https://github.com/pyzy/pyzy

Bittorrent client using Qt6 and libtorrent-rasterbar (web UI version)

https://www.qbittorrent.org/

Cross-platform crypto API for Qt

http://delta.affinix.com/qca/

Professional CAD system

https://www.ribbonsoft.com/qcad.html

Coroutines for Qt

https://github.com/danvratil/qcoro

Quick Database Manager

http://fallabs.com/qdbm/

PE2-like editor program for Unix

https://www.cc.ncu.edu.tw/~center5/product/qe/

QEMU CPU Emulator (tools only)

https://www.qemu.org/

QEMU CPU Emulator (github bsd-user branch)

https://www.qemu.org/

QEMU CPU Emulator - 7.X.X

https://www.qemu.org/

QEMU CPU Emulator - 8.X.X

https://www.qemu.org/

Graphical interface to git repositories

https://github.com/tibirna/qgit

GnuPG Made Easy (GPGME) Qt bindings

https://gnupg.org/software/gpgme/index.html

Qhull computes convex hulls, Delaunay triangulations, and halfspaces

http://www.qhull.org

Qhull computes convex hulls, Delaunay triangulations and halfspaces

http://www.qhull.org

Graphical effects and filters library for Qt5

https://sourceforge.net/projects/qimageblitz/

Library to manage JSON objects with Qt

http://qjson.sourceforge.net/

Quick Kanji Code Converter (C version)

https://hp.vector.co.jp/authors/VA000501/

EPWING dictionary viewer

https://github.com/ludios/qolibri/

Command-line tools for transforming and inspecting PDF documents

http://qpdf.sourceforge.net

Sudoku generating and solving software

http://people.freedesktop.org/~hughsient/appdata/

Tool to generate metal layers and vias

http://opencircuitdesign.com/qrouter/

Qt6 port of the Scintilla C++ editor class

https://riverbankcomputing.com/software/qscintilla/

A command line program to query game servers on the net

http://www.qstat.org/

Cross-platform application and UI framework (metaport)

https://www.qt.io/