Visual

Agilent VEE - Data-flow language, and open graphical programming environment, for iterative tests, measurement analysis, presenting results; optimized to use with data acquisition devices (digital voltmeters, oscilloscopes), and source devices (arbitrary waveform generators, power supplies).
http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-536900532.425703

Frequently Asked Questions: FAQ - From comp.lang.visual newsgroup.
http://www.faqs.org/faqs/visual-lang/faq/

Visual Programming Language - Brief, clear definition, explanation. [Wikipedia]
http://en.wikipedia.org/wiki/Visual_programming_language

SCIRun: A Scientific Programming Environment for Computational Steering - Framework where large computer simulations can be composed, executed, controlled, tuned interactively. Composing occurs via visual programming interface to a dataflow network. To execute programs, users specify parameters by graphical user interface rather than traditional text-based datafiles.
http://software.sci.utah.edu/scirun.html

Subtext: Alarming Development - Weblog for Subtext language. Polite discussion and debate on new programming models to simplify application programming.
http://alarmingdevelopment.org/

CodeMorphis Synopsis - A visual programming tool quickly build software applications by dragging and dropping icons that represent software components. [Commercial]
http://www.codemorphis.com/

Tersus Open Source Visual Programming Platform - Make web applications by drawing flow diagrams instead of writing code; based on AJAX, one language for user interface, client side behavior, server side processing; descriptions, documents, forum, downloads.
http://www.tersus.com/

ResearchIndex: Viz: A Visualization Programming System - Describes design, implementation of high level visualization programming system, created from a need to support rapid visual prototyping in an environment that can be extended by abstractions in the application problem domain.
http://citeseer.ist.psu.edu/hersey96viz.html

Fabrik: A Visual Programming Environment - Kit of object-oriented computational and user-interface components that can be 'wired' together to build new components and applications; diagrams use bidirectional dataflow links as shorthand for multiple paths of flow.
http://users.ipa.net/~dwighth/smalltalk/Fabrik/Fabrik.html

Lily - Browser-based cross-platform, visual dataflow programming environment, coded in JavaScript, allows making programs graphically, without writing code, by drawing links between data, images, sounds, text, graphics. Open source.
http://www.lilyapp.org/

Khoral Research, Inc.: KRI - Makes Khoros/Cantata visual dataflow programming language: rapid prototyping and cradle-to-grave software development, in a high productivity, integrated software systems environment.
http://www.khoral.com/

Visual Language Desk, VLDesk - Potent tool to automatically generate Visual Programming Environments, the reworked version of Visual Language Compiler-Compiler, VLCC. Description, download, publications.
http://www.scienzemfn.unisa.it/vldesk/

VisiQuest - A scientific data and image analysis product that has its own Visual Programming Environment. VisiQuest was formerly known as Khoros Pro of Khoral research. By AccuSoft Corporation.
http://www.accusoft.com

Opsis - Java applet for teaching binary search tree algorithms. It is unique in the way it combines programming, proof, and animation to enhance the learning experience. SourceForge. Open source, GPL.
http://opsis.sourceforge.net/

Sanscript - Visual dataflow programming language and development environment. Lets you draw applications. Script any COM or OLE Automation server with Sanscript Pro.
http://www.nwoods.com/sanscript/

CODE - Visual parallel programming system, composes sequential programs into parallel programs for shared-memory multiprocessors and workstations running MPI or PVM.
http://www.cs.utexas.edu/users/code/

Step Forward - A tool for developing information management and accounting systems using visual programming and high-level abstraction techniques.
http://www.stepforward.net

Subtext Info Page - Email list for Subtext language, with archives, means to subscribe and unsubscribe.
http://lists.csail.mit.edu/mailman/listinfo/subtext/

Visual Language Research Bibliography - Large, well structured bibliography of papers on visual language research, also has brief list of links to other visual language related research resources.
http://web.engr.oregonstate.edu/~burnett/vpl.html

Visual Programming Languages: A Survey - Paper by Marat Boshernitsan with historical overview of some pioneering efforts in the field.
http://nitsan.org/~maratb/cs263/

Petri Nets World - Petri Nets is a formal and graphical appealing language which is appropriate for modelling systems with concurrency.
http://www.informatik.uni-hamburg.de/TGI/PetriNets/

Libero - By iMatix Corp. Write top-level logic as readable state diagram and click. Libero generates: Assembler, C, C++, Java, VB, Unix shells, Perl, Awk, PL/SQL, PHP, and COBOL. Template-based code generator can be altered for any environment. Portable, fast, free: GPL.
http://legacy.imatix.com/html/libero/

Visual Languages - a description of Visual Programming Languages by Daniel LaLiberte.
http://www.hypernews.org/~liberte/computing/visual.html

Journal of Visual Languages and Computing - Bimonthly journal on promoting visual languages, and on their implications for computing.
http://www.elsevier.com/wps/find/journaldescription.cws_home/622907/description

Longflow Enterprises Ltd. - Makes Limnor general purpose codeless programming platform and development environment, based on prebuilt components, object-oriented; supports functional programming, ActiveX, C#, .NET, Visual Basic. Needs Windows XP and above.
http://www.limnor.com/

Cycling '74 - Sells Max/MSP and Jitter, a family of interactive graphical dataflow programming environments for audio, video, and graphical processing.
http://www.cycling74.com/products/maxmsp

Peter - A visual programming tool designated for easy and quick creation of applications for Windows 95/98/NT/2000. By Gemtree Software.
http://www.gemtree.com/peter.htm

Subtext - Experimental language to simplify application programming, based on copying (copied blocks are first class prototypes), live executable text, programming by example, prototypes. Description, FAQ, OOPSLA research paper, no download yet.
http://subtextual.org/

ExpressionFlow - Weblog on LabVIEW and visual object-oriented programming.
http://expressionflow.com/

Visual Languages for Knowledge Representation - Study of visual languages, mainly concept map-based languages; multiple representations. Broader interest than programming only. Many references.
http://pages.cpsc.ucalgary.ca/~kremer/papers/KAW98/visual/kremer-visual.html