Top Alternatives to OmniGraffle

Lucidchart is a leading web-based diagramming software that empowers individuals and teams to create complex visual representations of ideas, systems, and processes. It offers extensive shape libraries, real-time collaboration features, and seamless integration with popular productivity tools, making it ideal for flowcharts, UML diagrams, wireframes, and more.

draw.io is a versatile online diagramming tool providing a rich feature set for creating professional diagrams of all types. It offers robust integrations with major cloud storage providers and office suites, enabling seamless collaboration and accessibility. Its intuitive interface makes diagram creation straightforward for users of all skill levels.

Dia is a free and open-source diagramming software suitable for creating a variety of diagrams including flowcharts, UML diagrams, and network layouts.

yEd Graph Editor is a versatile and free desktop application for creating high-quality diagrams of various types, including flowcharts, UML diagrams, BPMN diagrams, and more. It offers powerful automatic layout algorithms and a wide range of formatting options, making it suitable for both simple and complex visualizations.

XMind is a leading mind mapping and brainstorming software designed for capturing thoughts, organizing ideas, and managing information effectively. Its intuitive interface and powerful features make it ideal for professionals, teams, and individuals seeking to enhance productivity and creativity.

Pencil Project is a free and open-source GUI prototyping tool that helps designers and developers create wireframes and mockups easily. Available as a standalone application and a Firefox extension, it offers a wide range of built-in shapes and templates for various platforms.

Microsoft Visio is a powerful diagramming tool designed to simplify complex information through visual representations like flowcharts, network diagrams, and floor plans. It is a key part of the Microsoft Office suite, offering a wide range of stencils and templates for various industries and needs.

LibreOffice Draw is a versatile vector graphics editor and diagramming tool included in the LibreOffice suite. It offers powerful tools for creating flowcharts, technical drawings, posters, brochures, and editing PDF files.

ConceptDraw PRO is a versatile diagramming tool designed for creating professional business graphics, flowcharts, mind maps, project diagrams, and more. It provides a comprehensive set of tools and libraries for visual communication and project management.

Creately is a collaborative online visual workspace that goes beyond traditional diagramming, enabling teams to visualize, strategize, and manage workflows effectively. It supports a wide range of diagram types and real-time collaboration, making it ideal for diverse teams and projects.

Balsamiq Mockups is a low-fidelity wireframing tool designed for rapid prototyping and brainstorming. It allows users to quickly create mockups of user interfaces and collaborate on design ideas with a focus on functionality rather than detailed visual design.

Moqups is a versatile web-based design and collaboration tool for creating wireframes, mockups, diagrams, and prototypes, streamlining the design process from concept to handoff.

PlantUML is an open-source tool that allows users to generate a wide variety of UML and other diagram types from a simple human-readable text description. It supports sequences, use case, class, activity, component, state, object, deployment, timing diagrams, and more, making it accessible and efficient for technical documentation and visualization.

Google Drawings is a versatile, web-based application for creating diagrams, flowcharts, and simple graphics. It integrates seamlessly with Google Drive and offers real-time collaboration, making it ideal for team projects and visual communication.

Graphviz is a powerful open-source graph visualization software package. It allows users to create complex diagrams and graphs from descriptive text files using the DOT language. Ideal for professionals, researchers, and developers needing to represent structured information visually.

Gliffy is a user-friendly, cloud-based diagramming tool that simplifies the creation of flowcharts, UML diagrams, floor plans, and other visual representations directly in your web browser.

Adobe XD is a powerful vector-based user experience design tool developed by Adobe. It is designed for creating prototypes for web and mobile applications with features like interactive mockups, animation, and responsive design capabilities. XD facilitates collaboration and sharing of design specs.

MindNode makes mind mapping intuitive and enjoyable, allowing users to visually organize their thoughts, ideas, and projects with ease. It's a powerful tool for brainstorming, note-taking, and planning.

Gephi is a powerful open-source software for exploring, visualizing, and manipulating networks and graphs of various types. It offers an intuitive interface for researchers, data scientists, and analysts to understand complex relational data.

Axure RP is a comprehensive software tool for designing, prototyping, and documenting digital products. It empowers UX professionals and designers to create interactive wireframes and prototypes with rich functionality, facilitating collaboration and stakeholder feedback.

Grafio is a comprehensive and user-friendly diagramming application designed for iOS, enabling users to effortlessly create various visual representations such as flowcharts, mind maps, and network diagrams. Its intuitive interface and robust feature set make it a versatile tool whether for professional documentation, brainstorming sessions, or personal organization.

Edraw Max is a powerful, all-in-one diagramming software for creating professional diagrams, charts, floor plans, network diagrams, and much more. It offers a vast library of templates and symbols for various industries, facilitating efficient visual communication and project planning for individuals and teams.

Umbrello UML Modeller is a comprehensive, free, and open-source UML diagram tool. It provides robust capabilities for creating a wide range of UML and other modeling diagrams, supporting developers and designers in visualizing complex systems.

Mockingbird is a streamlined online tool for creating interactive wireframes and mockups quickly. It helps designers, product managers, and developers visualize user flows and application UIs early in the design process, focusing on the core structure and interaction.

Fluid UI is a powerful, browser-based wireframing and prototyping tool designed specifically for creating interactive mobile touch interfaces with speed and ease. It empowers designers and developers to rapidly build and test ideas.

Diagramo is a robust, open-source web-based diagramming tool perfect for creating flowcharts, graphs, and various diagrams directly in your browser. Built on HTML5, it offers real-time collaboration and flexible export options, making it accessible and versatile.

Diagram Designer is a free, lightweight vector graphics editor for creating various diagrams, including flowcharts, UML diagrams, illustrations, and slideshows.

MockFlow is a comprehensive design platform offering a suite of tools for wireframing, prototyping, UI mockups, and collaboration. It helps teams visualize and iterate on ideas for websites and applications.

VisiTouch, though discontinued, was an iOS application designed for viewing and converting Microsoft Visio diagrams (VSD, VDX, VSDX) on iPhone. It provided a convenient way to access and share your Visio files on the go, integrating features like PDF conversion and collaboration.

Nevron Draw is a comprehensive diagramming software designed to help users create professional-looking diagrams, flowcharts, floor plans, and more. It offers a rich feature set, collaborative capabilities, and extensive export options for various diagramming needs.

Diagrammix is a robust macOS application engineered for the efficient creation of professional-looking diagrams, flowcharts, and various graphical representations. It offers a user-friendly interface combined with powerful tools to quickly visualize complex information.