OmniGraffle is a diagramming and digital illustration application for macOS and iOS. Developed by The Omni Group
License: Commercial
OmniGraffle is a powerful and intuitive diagramming tool that excels in advanced features and user experience, making it ideal for professional designers. In contrast, LibreOffice Draw is a free, open-source alternative that offers basic vector graphics capabilities and is suitable for users looking for a cost-effective solution.