Diagramo is an online flowchart software. It's FREE and Open Source ( GPL ) It's pure HTML5 Share and collaborate. Developed by Diagramo
License: Open Source
Diagramo is an open-source, user-friendly tool ideal for simple diagrams and collaboration, making it accessible for casual users. In contrast, OmniGraffle is a professional-grade application with advanced features and offline capabilities, making it suitable for detailed and complex diagramming tasks.