I&#x27;ve got iDraw (Now Autodesk Graphic) on OS X.  It&#x27;s okay - but I still long for something that can go head-head with Visio.  Omnigraffle is sort of in that space - but at the end of the day, there is a reason why 99%+ of network diagrams are done in Visio - just seems to fit in better when you are trying to line up routers, draw connections between them and network segments.