Sites and apps similar to DiagramDeck include draw.io, which is free and open source. Other options are yEd Graph Editor, Lucidchart, Microsoft Visio and PlantUML. You can choose from more than 10 Diagram Editors like DiagramDeck for Mac, Windows, Linux, self-hosting and Android.
Web-based diagram platform offers real-time teamwork, 50+ diagram and mind mapping types, technical wireframing, smart objects, templates, version control, secure cloud storage, PDF export, collaboration tools, commenting, and integration for business and education use.
Australia
Sketch, walk through, and share system design flows. Drag components, connect them, and present each interaction step by step — no account needed to try.
India
Diagramiq is an online app for creating Flowcharts, UML, BPMN, Network Diagrams, Decision Trees and more. It's blazing fast, intuitive and it has a wide-range of predefined shapes to get you started.
