Vexlio

Instantly create precise, beautiful diagrams

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From the site If we had to summarize Vexlio in a phrase, “easy precision” would be it. Much of the power of Vexlio is the robust automatic snapping system that forms its foundation. No more time spent making careful, tedious manual adjustments to ensure the objects in your diagrams are visually lined up. With Vexlio, lines, arrowheads, and other objects snap into perfect geometric alignment every time. Vexlio also provides a number of useful tools, such as native LaTeX equation editing and quick object duplication, that you will find indispensible for your technical diagrams.
This is pretty neat
How is this better than OmniGraffle?