Visual programming language
In computing, a visual programming language (VPL) is any programming language that lets users create programs by manipulating program elements graphically rather than by specifying them textually. A VPL allows programming with visual expressions, spatial arrangements of text and graphic symbols, used either as elements of syntax or secondary notation. For example, many VPLs (known as dataflow or diagrammatic programming) are based on the idea of "boxes and arrows", where boxes or other screen objects are treated as entities, connected by arrows, lines or arcs which represent relations.
VPLs may be further classified, according to the type and extent of visual expression used, into icon-based languages, form-based languages, and diagram languages. Visual programming environments provide graphical or iconic elements which can be manipulated by users in an interactive way according to some specific spatial grammar for program construction.
The general goal of VPLs is to make programming more accessible to novices and to support programmers at three different levels 
- Syntax: VPLs use icons/blocks, forms and diagrams trying to reduce or even to completely eliminate the potential of syntactic errors helping with the arrangement of programming primitives to create well-formed programs. Non VPLs examples would be spell check in word processors underlining or even auto correcting individual words or grammar.
- Semantics: VPLs may provide some mechanisms to disclose the meaning of programming primitives. This could include help functions providing documentation functions built-in to programming languages.
- Pragmatics: VPLs support the study of what programs mean in particular situations. This level of support allows users to put artifacts created with a VPL into a certain state in order to explore how the program would react to that state. Examples: In AgentSheets or AgentCubes users can set games or simulations into a particular state in order to see how program would react. With the Thymio programming language users can bring a robot into a certain state in order to see how it will react, i.e., which sensors will be activated.
A visually transformed language is a non-visual language with a superimposed visual representation. Naturally visual languages have an inherent visual expression for which there is no obvious textual equivalent.
Current developments try to integrate the visual programming approach with dataflow programming languages to either have immediate access to the program state, resulting in online debugging, or automatic program generation and documentation. Dataflow languages also allow automatic parallelization, which is likely to become one of the greatest programming challenges of the future.
The Visual Basic, Visual C#, Visual J# etc. languages of the Microsoft Visual Studio IDE are not visual programming languages: the representation of algorithms etc. is textual even though the IDE embellishes the editing and debugging activities with a rich user interface. A similar consideration applies to most other rapid application development environments which typically support a form designer and sometimes also have graphical tools to illustrate (but not define) control flow and data dependencies.
List of visual languages
The following contains a list of notable visual programming languages.
- AgentCubes, 3D and 2D game design and simulation design computational thinking tools.
- AgentSheets, game authoring and computational science authoring tool.
- Alice, an object based language used to program 3D environments.
- Analytica, for building and analyzing quantitative models for decision and risk analysis.
- App Inventor for Android, a tool for creating Android applications, based on Blockly and Kawa.
- Bubble, for creating production-ready web applications.
- Etoys, for scripting.
- Flowgorithm, creates executable flowcharts which can be converted to several languages.
- Hopscotch, an iPad app, and visual programming language for creating touchscreen-oriented mobile applications.
- Kodu, a visual programming tool for Logo.
- Kojo, a programming language, IDE, and learning environment.
- mBlock, an extension of Scratch for Arduino hardware interfaces. Developed by Makeblock.
- Open Roberta, online programming environment from Fraunhofer IAIS, designed for children.
- Raptor, a product of the USAF, for drawing executable flowcharts.
- Scratch, a product of MIT, designed for children in K-12 and after-school programs.
- Snap!, a browser-based reimplementation of BYOB, and extension of Scratch, with first class procedures and lists. Used for teaching at UC Berkeley.
- Stagecast Creator, formerly Apple's Cocoa: Internet Authoring for Kids.
- StarLogo, an agent-based simulation language developed by Mitchel Resnick, Eric Klopfer, and others at MIT Media Lab. An extension of the Logo programming language (a dialect of Lisp).
- ToonTalk, programming system for children.
- Visual Logic, for creating executable flowcharts.
- AudioMulch, an audio signal flow based sound and music creation environment
- Blender (software), the open source 3D graphics package, includes a "node editor" to create shading programs as graphs. Also, custom nodes allows create systems as sverchok, blendgraph or other.
- Cameleon, graphical functional language
- Clickteam's The games factory/Multimedia fusion series, environments made for visually developing games
- Dynamo, a generative modeling interface for Autodesk Revit
- Filter Forge Node based filter generation for image processing.
- Grasshopper 3d, a generative modeling interface for Rhinoceros 3D
- Kyma (sound design language), a visual programming language for sound design used by musicians, researchers, and sound designers.
- Mama (software) – a programming language and IDE for building 3D animations and games
- Max (software), visual programming environment for building interactive, real-time music and multimedia applications
- Nodal, a node-based generative programming software application for music composition
- Nuke, a object-based visual programming software for visual effects compositing by The Foundry powered by Tcl, Python and Blink-script.
- OpenMusic, a visual programming language for music composition (based on Common Lisp Object System (CLOS)) applications, and mobile applications
- Pure Data (Pd) is a visual programming language developed for creating interactive computer music and multimedia works.
- Quartz Composer, a language for processing and rendering graphical data (macOS)
- Reaktor, a DSP and MIDI-processing language by Native Instruments
- Scala Multimedia Authoring suite and complete multimedia system for AmigaOS and Windows
- Softimage,with ICE Interactive Creative Environment.
- SynthEdit, a Synthesizer construction tool using a VPL.
- TouchDesigner, visual programming language for real-time multimedia content
- Virtools, a middleware used to create interactive 3D experiences
- vvvv, a general purpose toolkit with a special focus on real-time video synthesis and programming large media environments with physical interfaces, real-time motion graphics, audio and video.
- WireFusion, visual programming environment for creating interactive 3D web presentations
- Vsxu, music visual / real-time 3D graphics generation (Windows, GNU/Linux, and macOS)
- Blender Game Engine (Graphical logic editor)
- Construct 2 is an HTML5-based 2D game editor, developed by Scirra Ltd.
- CryEngine has a node-based visual programming language called FlowGraph.
- GameMaker Studio, has a drag and drop game creation system developed by YoYo Games.
- GameSalad is a visual game creation tool developed by GameSalad, Inc.
- Godot, in-house open source MIT Licensed game development software made by OKAM Studio.
- Human Resource Machine is a visual programming-based puzzle game developed by Tomorrow Corporation.
- Kodu, a software designed to program games with a 3D Interface developed by Microsoft Research.
- Rec Room includes a game creation system with a node-based visual programming language called Circuits.
- Snowdrop has a visual scripting system.
- Stencyl, a video game creation tool.
- Unity has an editor extension on the Unity Asset Store called Playmaker made by Hutong Games.
- Unreal Engine 4 has a node-based visual programming language called Blueprints.
Many modern video games make use of behavior trees, which are in principle a family of simple programming languages designed to model behaviors for non-player characters. The behaviors are modeled as trees, and are often edited in graphical editors.
Systems / simulation
- Analytica, a commercial visual language for decision models based on influence diagrams.
- DRAKON, a graphical algorithmic language
- EICASLAB, a software suite including a graphical language for supporting the design of control architectures
- Flowcode is a graphical programming language to program embedded microprocessors
- Function block diagrams, used in programmable logic controllers
- GNU Radio, a development toolkit which provides signal-processing blocks to implement software-defined-radios and signal-processing systems
- KNIME, the Konstanz Information Miner, is an open source data analytics, reporting and integration platform
- LabVIEW, a graphical language designed for engineers and scientists
- Ladder logic, a language that simulates relay logic commonly used in programmable logic controllers
- MeVisLab, cross-platform application framework for medical image processing and scientific visualization
- Microsoft Visual Programming Language, dataflow language for robotics programming that is a component of Microsoft Robotics Studio
- MindRover, a robot programming game incorporating a dataflow "wiring" language
- Minibloq, visual programming language for robotics and Arduino compatible boards
- MST Workshop, an interactive visual programming language for creating mathematical solutions, rapid prototyping, two-dimensional and three-dimensional graphic applications
- Node-RED: software system rapid development toolkit
- NXT-G, a visual programming language for the Lego Mindstorms NXT robotics kit
- OpenDX scientific data visualization using a visual programming language and data flow model
- OpenWire - adds visual dataflow programming abilities to Delphi via Visual Component Library (VCL) components and a graphical editor (homonymous binary protocol is unrelated)
- Orange - An open-source, visual programming tool for data mining, statistical data analysis, and machine learning
- OutSystems language, a visual modeling language to develop and change all layers of business centric web applications
- Prograph - an object-oriented programming language that uses iconic symbols to represent actions to be taken on data
- Ptolemy Project - a project aimed at modeling and designing real-time embedded systems.
- Qucs graphical interface to set up simulation of electronic circuit signal and noise behavior
- Reallusion - iClone, a 3D software with Lua language and visual programing design
- ROBO Pro, a visual programming language for the fischertechnik robotics kit
- Scicos A graphical language associated with the numerical analysis package ScicosLab (originally SciLab)
- Simulink, graphical programming environment for modeling, simulating and analyzing multidomain dynamical systems
- Sequential function chart, a Petri-net like programming language for programmable logic controllers
- Stateflow, a graphical language that includes executable state transition diagrams, flow charts, state transition tables, and truth tables
- STELLA, a VPL for system dynamics modeling
- Softimage ICE, a node-based system that is used to create and modify 3D models, simulate particles and perform various other tasks
- VisSim, modeling and simulation language, allows making mathematical models quickly and executing them in real-time
- CiMPLE, Visual Programming Language by ThinkLABs for teaching robotics
- Flow a graphical integration language used in the webMethods platform
- Pipeline Pilot is a scientific visual and dataflow programming language, and the authoring tool for the Accelrys Enterprise Platform.
Data warehousing / business intelligence
- Ab Initio, a tool for ETL processing by creating graphs
- Alteryx Designer, a tool for data processing and analytics incorporating SQL, R, and Python.
- Apache Nifi, software project to automate the flow of data between software systems.
- IBM Cognos Business Intelligence, is an example for front-end programs in Business Intelligence applications, which are used to generate SQL queries to run against RDBMS databases
- IBM InfoSphere DataStage, an ETL tool
- Informatica Powercenter is an ETL tool to design mappings graphically for data load in Data Warehouse systems
- Microsoft SQL Server Integration Services (SSIS), a platform for data integration and workflow applications
- Pentaho Data Integration (PDI), formerly named Kettle, an open-source ETL tool
- Kwikpoint, an isotype visual translator created by Alan Stillman
- Lava, an experimental object oriented RAD language
- Limnor, a general purpose programming system. Limnor Studio is an IDE for rapid software development.
- Morphic (software), makes it easier to build and edit graphical objects by direct manipulation and from within programs; the whole Self (programming language) programming environment is built using Morphic
- Piet, an esoteric language, the program is an image whose pixels are the language's elements
- StreamBase Systems, StreamBase EventFlow is a visual programming language for processing streaming events
- WebML, is a visual language for designing complex data-intensive Web applications that can be automatically generated
- Yahoo! Pipes is a visual data-flow programming system to process web data 
- YAWL, graphical workflow language
- AppWare, also known as MicroBrew, icon based programming for classic Mac OS and Microsoft Windows
- Macromedia Authorware - flowchart based programming language
- Helix and Double Helix, a pioneering database management system for the Apple Macintosh platform, created in 1983
- Illumination Software Creator, a language and IDE for visually creating desktop and mobile software
- DRAKON (Dragon), a SDL- and AADL-influenced visual 2D programming language designed for developing the on-board hard real-time software system for automatic flight and landing of the Soviet/Russian Buran (Snowstorm) orbiting spacecraft
- Executable UML, a profile of the Universal Modeling Language specification defining executable semantics for a subset of UML
- Argument map
- Cognitive dimensions of notations - Notation assessment for visual and non-visual languages
- Concept map
- Dataflow programming
- Deutsch limit, an aphorism about the information density of language primitives in a visual notation
- Domain-specific modeling
- Drag and drop
- Flow-based programming
- Graph drawing
- Low-code development platform
- No-code development platform
- Programming game
- Unified Modeling Language
- Visual language
- Visual thinking
- Graphical Programming Environments for Educational Robots: Open Roberta - Yet Another One? from the IEEE
- The Maturity of Visual Programming
- Diagrammatic-graphical programming languages and DoD-STD-2167A from the IEEE
- Repenning, A., "Moving Beyond Syntax: Lessons from 20 Years of Blocks Programing in AgentSheets", Journal of Visual Languages and Sentient Systems, July 2017.
- Johnston, W.M.; Hanna, J.R.P.; Millar, R.J. (2004). "Advances in dataflow programming languages" (PDF). ACM Computing Surveys. 36 (1): 1–34. doi:10.1145/1013208.1013209. Retrieved 2011-02-16.
- Rekers, Jan, and Andy Schürr. "Defining and parsing visual languages with layered graph grammars." Journal of Visual Languages & Computing 8.1 (1997): 27-55.
- Zhang, Da-Qian, Kang Zhang, and Jiannong Cao. "A context-sensitive graph grammar formalism for the specification of visual languages." The Computer Journal 44.3 (2001): 186-200.
- Construct Classic home page
- Construct Classic page on SourceForge
- "Yahoo! pipes". Archived from the original on 2015-01-03. Retrieved 2015-01-03.