Diagramo is described as 'online flowchart software' and is an website in the Office & Productivity category. There are more than 50 alternatives to Diagramo, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and iPad. The best alternative is diagrams.net, which is both free and Open Source. Other great sites and apps similar to Diagramo are Pencil Project (Free, Open Source), LibreOffice - Draw (Free, Open Source), yEd Graph Editor (Free) and Dia (Free, Open Source).
EaSynth ForeUI is an easy-to-use UI prototyping tool. You can use ForeUI to create skinnable prototype of software or website, and run the interactive simulation in your web browser. You can switch the UI theme of the prototype, thus the fidelity will be changed as well.
Visio Viewer opens Visio drawings directly on a computer without conversion on external Web Servers. Viewing Visio documents is as simple as drag and dropping of files (with a .vsd, .vsdx, .vdx extension) to the Application window.
Famous is a design tool that allows you to create and publish live progressive web apps. It's the only tool in the market that lets designers generate a live experience without needing to know any code and without needing any engineers.
Aspose.Diagram is a .NET Visio Diagramming component that allows working with VSD, VSS, VST, VSX, VTX, CDW and VDX files on Mono, C#, VB.NET, ASP.NET web applications, web services and Windows applications. It enables developers to work with VSD & VDX files on ASP.
Lekh Diagram empowers you to express your idea on iPad and iPhone simply by sketching shapes with your finger. Lekh Diagram can be used to make diagrams, flow chart, organizational chart, business process diagram, venn diagram, mind maps and any kind of illustrations.
Core2D is a multi-platform application for making data driven 2D diagrams. The application has built-in wyswig vector graphics editor where you can bind data to shapes, share data across multiple documents, edit documents using layers.