1. LucidChart

    LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

  2. draw.io

    Online diagramming application

  3. yEd Graph Editor

    yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.

  4. Visio

    Simplify and communicate complex information using data-linked diagrams.

  5. OmniGraffle

    OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.

  6. D

    Dia

    Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.

  7. Invision

    Prototyping and collaboration for design teams

  8. PlantUML

    PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

  9. FreeMind

    FreeMind is a premier free mind-mapping software written in Java.

  10. LibreOffice - Draw

    Draw, LibreOffice, ODF, open standards, creative software, vector drawing

  11. XMind

    XMind is a brainstorming and mind mapping application.

  12. Pencil Project

    Single-user mockup / wireframing / diagramming tool