Network diagram software on os x Edraw is a great network diagram Visio alternative for Mac OS X. What is the best diagram drawing software UML, DFD ERD, FLOWCHART available free online? Dear all, I hope you are well, I look to find the best diagram drawing software UML, DFD ERD, FLOWCHART. The only sad part is that it is only available for the macOS system, hence, Windows users cannot make use of this awesome software. OmniGraffle is by far the best looking diagramming tool out there. Visual Paradigm Community - the Best #1 FREE UML Tool in the market! Visual Paradigm Community Edition was launched since 2004 to provide a free UML software for sole non-commercial purpose, supporting users who was making their first steps in UML modeling, and who need a free and cross-platform UML modelling software for personal use, such as applying UML on student.
