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).
OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click.
Draw, part of the Apache OpenOffice suite, is a graphics editor that gives you the tools to communicate with visuals and diagrams. With a maximum page size of 300cm by 300cm, Draw is powerful tool for posters, graphs, charts, and more.
Cacoo is a user-friendly online diagramming tool that allows you to create a variety of diagrams such as wireframes, flowcharts, UML diagrams, network diagrams, mindmaps, sitemaps, database diagrams, and more.
High performance and scalable visual modeling tool for the planning, design and construction of business architectures, software and systems. With customers based in all industries, Sparx Systems is a leading vendor of innovative modeling solutions.