Cecilia is an audio signal processing environment. Cecilia lets you create your own GUI (grapher, sliders, toggles, popup menus) using a simple syntax. Cecilia comes with many original builtin modules for sound effects and synthesis.

Previously written in tcl/tk, Cecilia (version 4, deprecated) was entirely rewritten in Python/wxPython and uses the Csound API for communicating between the interface and the audio engine. Version 4.2 is the final release of version 4.

Cecilia5 now uses the pyo audio engine created for the Python programming language. pyo allows a much more powerfull integration of the audio engine to the graphical interface. Since it's a standard python module, there is no need to use an API to communicate with the interface.

SW_Gui is a tabbed GUI interface that keeps the most useful tools at your fingertips in a single window and has a customizable launcher so you can access anything else you may need.

"Ephestos" is a visual programming environmet for python similar to an IDE but with some fundamental diffirences. Ephestos uses its own GUI called "Morpheas" a very modular gui that not only is capable of offering a graphical user interface to the user, that interface is easily customisable by the user , made solely from small blocks called "morphs", with no required coding. Also the code is edited visually using morphs again to further help the user. For now the project is still in its infancy with many feature to implement , but is however a usable Blender addon that is constantly developed. Using any of the above button you can download the source or visit the repository at github.

The Qt SDK combines the Qt framework with tools designed to streamline the creation of applications for Symbian phones and the Nokia N9 smartphone. in addition to desktop platforms, such as Microsoft Windows, Mac OS X, and Linux.

Welcome to the home of wxPython, a blending of the wxWidgets C++ class library with the Python programming language.

This is meant to be a comprehensive guie on how to get started coding a cross platform GUI application using python. Using Eclips, PyDev, PyQT.

For achieving this we will use Eclipse with the plug-in PyDev and PyQT which is python bindings for the cross platform UI framework QT. My aim is to make this guide as thorough as possible so if you already know some of the following parts please just skip them.
If anything is missing or you find something unclear please leave a comment and I will correct it.

PySide is an open source sofware project providing Python bindings for the Qt framework. Qt is a cross-platform application and UI framework, allowing the developers to write applications once and deploy them across many operating systems without rewriting the source code, while Python is a modern, dynamic programming language with a vivid developer community.

Combining the power of Qt and Python, PySide provides the wealth of Qt framework for developers writing software in Python and presents a first-class rapid application development platform available on all major operating systems.

The PySide project provides LGPL-licensed Python bindings for the Qt cross-platform application and UI framework. PySide Qt bindings allow both free open source and proprietary software development and ultimately aim to support all of the platforms as Qt itself.

Qt ( /ˈkjuːt/ "cute", or unofficially as Q-T cue-tee[5][6]) is a cross-platform application framework that is widely used for developing application software with a graphical user interface (GUI) (in which cases Qt is classified as a widget toolkit), and also used for developing non-GUI programs such as command-line tools and consoles for servers.

Tcl (Tool Command Language) is a very powerful but easy to learn dynamic programming language, suitable for a very wide range of uses, including web and desktop applications, networking, administration, testing and many more. Open source and business-friendly, Tcl is a mature yet evolving language that is truly cross platform, easily deployed and highly extensible.

Tk is a graphical user interface toolkit that takes developing desktop applications to a higher level than conventional approaches. Tk is the standard GUI not only for Tcl, but for many other dynamic languages, and can produce rich, native applications that run unchanged across Windows, Mac OS X, Linux and more.

Fredrik Lundh

The Tkinter3000 WCK from effbot.org lets you write your own Tkinter widgets, in Python.

Tkinter Wiki

Tkinter is the most portable GUI toolkit for Python. The aim of this Wiki is to gather information to help Python programmers better use Tkinter.

Tkinter is Python's de-facto standard GUI (Graphical User Interface) package. It is a thin object-oriented layer on top of Tcl/Tk.

Tkinter is not the only GuiProgramming toolkit for Python. It is however the most commonly used one. CameronLaird calls the yearly decision to keep TkInter "one of the minor traditions of the Python world."

PythonToolkit (PTK) is an interactive environment for python. It was originally designed to provide a python based environment similiar to Matlab for scientists and engineers when used together with the numpy, scipy and matplotlib python packages. However it can also be used as a general purpose interactive python environment especially for interactive gui programming.

PythonCard is a graphical user interface (GUI) construction kit for easily building cross-platform desktop applications on Windows, Mac OS X, and Linux, using the Python language. It is built using WxPython and WxWidgets, and draws its inspiration from the HyperCard application for the Apple Macintosh

This page provides some brief descriptive information on a number of GUI toolkits available for Python. For a full list of of toolkits with more in-depth information, see GuiProgramming.

Python has a huge number of GUI frameworks (or toolkits) available for it, from Tkinter (traditionally bundled with Python, using Tk) to a number of other cross-platform solutions, as well as bindings to platform-specific (also known as "native") technologies

c74 is an iPhone / iPod Touch app that let's you connect your device with Cycling '74's Max/MSP 5/6.

The massive improvement over existing interface layout apps is that the layout is dynamically controlled by Max. Therefore we can have the interface adapt to the tasks it has to perform in real-time.

In order to connect this app to Max please download the free external from : http://www.nr74.org/c74/c74v152.zip (requires osx 10.5 or higher !)

A powerful Mac client for Git and Mercurial distributed version control systems.

SourceTree strips away the complexity of DVCS and makes it usable for mere mortals.

Meet the most user-friendly Git client for Mac: Tower

A very rarely updated guide to Supercollider programming.

Conductors: a fast GUI
I usually use Conductors because they're quick and dirty and can very easily be used to control a synth or a pbind. This class is from Ron Kuivila and it's included in the Wesleyan build or else available as quark. (See the Quarks helpfile for more on how to get it.)

CocoaDialog is an OS X application that allows the use of common GUI controls such as file selectors, text input, progress bars, yes/no confirmations and more with a command-line application. It requires no knowledge of Cocoa, and is ideal for use in shell and Perl scripts (or Ruby, or Python, or... etc).

pyglet provides an object-oriented programming interface for developing games and other visually-rich applications for Windows, Mac OS X and Linux.

Including Load images, sound, music and video in almost any format. pyglet can optionally use AVbin to play back audio formats such as MP3, OGG/Vorbis and WMA, and video formats such as DivX, MPEG-2, H.264, WMV and Xvid.

SQLite Database browser is a light GUI editor for SQLite databases, built on top of Qt. The main goal of the project is to allow non-technical users to create, modify and edit SQLite databases using a set of wizards and a spreadsheet-like interface.

IceClean is a powerful System Maintenance and Optimization Tool using only UNIX built-in System Tasks to help your Mac stay healty and to keep it running smoothly. Version 3.0 is now completely renewed in Scripting and Cocoa Interface for help you in faster and useful Tasks Managing of All Unix Power.

Spyder is the Scientific PYthon Development EnviRonment:

a powerful interactive development environment for the Python language with advanced editing, interactive testing, debugging and introspection features
and a numerical computing environment thanks to the support of IPython (enhanced interactive Python interpreter) and popular Python libraries such as NumPy (linear algebra), SciPy (signal and image processing) or matplotlib (interactive 2D/3D plotting).

Definition: Human-Computer Interaction (HCI) is a discipline concerned with the design, evaluation and implementation of interactive computing systems for human use and with the study of major phenomena surrounding them. -- 1992, SIGCHI Curriculum Development Group

Shoes is a cross-platform toolkit for writing graphical apps easily and artfully using Ruby.
Unlike most other GUI toolkits, Shoes is designed to be easy and straightforward without losing power. Really, it’s easy!

This is a repository for integration of Qt GUI into SuperCollider

Cecilia serves the composer with little programming experience and the programmer with little composing experience. There is very little, sound wise, that cannot be done with Cecilia. Cecilia operates on top of Csound, the audio/dsp engine from Barry Vercoe at MIT.

Graphic user interface for CSound
Cecilia is a graphic user interface for the sound synthesis and sound processing package Csound. Cecilia enables the user to build very quickly graphic interfaces with sliders and curves to control Csound intruments. It is also an editor to Csound with syntax highlighting and a built-in reference. Cecilia is also a great tool to explore the parameters of a new opcode in an interactive and intuitive way.

GitX is a git GUI made for Mac OS X. It currently features a history viewer much like gitk and a commit GUI like git gui. But then in silky smooth OS X style!

ref. from Programming Ruby - The Pragmatic Programmer's Guide

The Tkinter module (“Tk interface”) is the standard Python interface to the Tk GUI toolkit. Both Tk and Tkinter are available on most Unix platforms, as well as on Windows systems. (Tk itself is not part of Python; it is maintained at ActiveState.)

PyQt is a set of Python bindings for Nokia's Qt application framework and runs on all platforms supported by Qt including Windows, MacOS/X and Linux. There are two sets of bindings: PyQt v4 supports Qt v4; and the older PyQt v3 supports Qt v3 and earlier. The bindings are implemented as a set of Python modules and contain over 300 classes and over 6,000 functions and methods.

One of the great things about cmake is that it supports multiple GUI development environments, including Xcode on the Mac, Microsoft Visual Studio on Windows, and KDevelop on Linux (and even on Mac!). Here's how you generate an Xcode project:

QuteCsound is a frontend for Csound featuring a highlighting editor with autocomplete, interactive widgets and integrated help. It is a cross-platform and aims to be a simple yet powerful and complete development environment for Csound. It can open files created by MacCsound.

PXDK is a GUI cross-platform development kit, designed specifically for audio plug-ins. It is the perfect tool for making stable, professional plug-ins for multiple targets, without sacrificing any advanced features.
PXDK is an object-oriented system, using C++. Yes, this means you can produce Cocoa plug-ins on 64-bit OSX, without even reading 1 single line of Obj-C. This is the power of PXDK. Instead of using your energy on ever-changing APIs, you can focus on the value which the end-user can appreciate.

PXDK is available for VST 2.4, VST 3, AU, RTAS and TDM, Windows and OSX, 32- and 64-bit, Carbon and Cocoa. And for every single one of those platforms, your code is the same (although, for TDM you would obviously need to write extra DSP code).

SUN Microsystem's concept of their future OS GUI

CocoaMySQL is an application used to manage MySQL databases (locally or over the internet). It lets you add and remove databases and tables, change fields and indexes, view and filter the content of tables, add, edit and remove rows, perform custom queries and dump tables or entire databases.

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Sequel Pro is the successor of CocoaMySQL!