Diagram Software for Windows

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Browse free open source Diagram software and projects for Windows below. Use the toggles on the left to filter open source Diagram software by OS, license, language, programming language, and project status.

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  • 1
    diagrams.net

    diagrams.net

    Security-first diagramming for teams

    Bring your storage to our online tool, or go max privacy with the desktop app. Diagram files created in 2005 will load in the app today. Works with Google Drive and Google Workplace (G Suite). Use add-ons for Docs, Sheets and Slides. It works with OneDrive and Sharepoint. Office 365 app for Word, Powerpoint and Excel. Highest-rated Confluence app in the Atlassian Marketplace. Works in Jira too. Works with GitHub, GitLab and Dropbox for visual documentation in distributed teams. You can download diagrams.net Desktop for offline use on Windows, macOS, Linux and ChromeOS. Nextcloud is an ideal on-premise file hosting system for diagrams.net.
    Downloads: 138 This Week
    Last Update:
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  • 2

    mermaid

    Diagram and flowchart generation from text similar to markdown

    mermaid is a JavaScript-based diagram and flowchart generating tool that uses markdown-inspired text for fast and easy generation of diagrams and charts. Forget about using heavy tools to explain your code. mermaid greatly simplifies documentation with its simple markdown-like script language, and offers a great range of diagram and chart options. The latest version of mermaid comes with a number of bug fixes and enhancements, as well as a new diagram type, entity relationship diagrams. Its range of available diagrams include flowcharts, sequence diagrams, gantt diagrams and more, with new ones continuously being developed.
    Downloads: 101 This Week
    Last Update:
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  • 3
    Pencil

    Pencil

    The Pencil Project's unique mission is to build a free tool

    Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms. The latest stable version of Pencil is 3.1.0 which contains stability fixes and many new features. More details can befound in the releaste notes. Pencil provides various built-in shapes collection for drawing different types of user interface ranging from desktop to mobile platforms. Starting from 2.0.2, Pencil is shipped with Android and iOS UI stencils pre-installed. This makes it even easier to start protyping apps with a simple installation. Starting from 2.0.2 Pencil has even more shape collections included by default. The list of built-in collections now includes general-purpose shapes, flowchart elements, desktop/web UI shapes, Android and iOS GUI shapes.
    Downloads: 38 This Week
    Last Update:
    See Project
  • 4
    UCanCode Visio 2023

    UCanCode Visio 2023

    UCanCode Visio 2023, the best replace of Microsoft Visio

    UCCVisio makes it easy to create various types of diagrams, including flowcharts, organizational charts, mind maps, network diagrams, floor plans, family tree diagrams, business model diagrams, flyers, certificates, and more. Charts - Charts and graphs are visual representations of information. They are useful for documenting facts, drawing plans and capturing ideas, as well as enhancing communication, learning and productivity. UCCVisio is a set of 100% free drawing software provided by UCanCode software company!
    Downloads: 16 This Week
    Last Update:
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  • 5
    Brass fingering chart generator

    Brass fingering chart generator

    Fingering chart generator for brass wind instruments

    This Windows app generates fingerings for brass wind instruments. It invokes gnuplot to make a diagram showing the harmonic and error for the selected fingering, as well as for alternate fingerings. The program finds all fingerings within an acceptable error range, then chooses the one with the lowest harmonic (shortest tubing length). If no fingering falls in the acceptable error range, the closest match is chosen.
    Downloads: 3 This Week
    Last Update:
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  • 6

    BizDiag

    Business graphics diagramming application + customizable shape lib.

    BizDiag V1.9 All new version (based on Mono and GTK#, developed with MonoDevelop 2.4.1). BizDiag V1.0, V1.1, V1.2 Business graphics diagramming application + diagram editor library for vector graphics (based on Piccolo2D from University of Maryland, .NET and Windows.Forms developed with Visual Studio 2008). Supports browser-enabled special SVG file format for import and export and customizable shape library.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    CirPaint

    CirPaint

    Circuit diagram editor with device editor

    Circuit diagram editor with library, device editor and adjustable graphic
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    The Doodle project aims to provide a language to easily describe Origami diagrams and produces a ready-to-print document. Doodle will free creators from diagramming constraints and increase their capability to share their creations.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    New version of the Doodle project (http://doodle.sf.net). This project is related to Origami (paper folding) diagramming.The goal of this new version is to overcome limitations of the existing Doodle to propose an Integrated Diagramming Environment.
    Downloads: 0 This Week
    Last Update:
    See Project
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  • 10
    GoJS

    GoJS

    JavaScript diagramming library for interactive flowcharts & org charts

    Build interactive flowcharts or flow diagrams. Let your users build, modify, and save diagrams with JSON model output. Visualize state charts and other behavior diagrams. Create diagrams with live updates to monitor state, or interactive diagrams for planning. GoJS allows considerable customization of links and nodes to build all kinds of diagrams. Visualize flow, or connect pipes. Create genogram and medical diagrams, or editable family trees with collapsible levels. Create classic org charts for viewing or editing. Automatic layouts make different visualization options easy. Dynamically add ports and custom link routing. Use data-bindings to save and load routes within the Model JSON. Use groups as containers and subgraphs, with group members bound by their own rules and layouts. Model industrial processes, workflows, SCADA diagrams and more.
    Downloads: 0 This Week
    Last Update:
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  • 11
    Diagramming components library for creating graphical applications in WPF.
    Downloads: 0 This Week
    Last Update:
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  • 12
    SVG export script for powerpoint. You create a diagram using powerpoint's shapes, text boxes, drawing tools, etc. Then you run export_to_svg (a macro) and bingo you have an SVG fragment that you can view in your favourite browser.
    Downloads: 0 This Week
    Last Update:
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  • 13
    [Delphi] Object-oriented library designed to help you with the developing of simple CAD applications and diagramming.
    Downloads: 0 This Week
    Last Update:
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  • 14
    VSL: Virtual Steganographic Laboratory

    VSL: Virtual Steganographic Laboratory

    Steganography and steganalysis software

    VSL is free image steganography and steganalysis software in form of graphical block diagramming tool. It allows complex using, testing and adjusting different steganographic techniques and provides simple GUI along with modular, plug-in architecture
    Downloads: 8 This Week
    Last Update:
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