2 recommended

1
AutoDraw

Autocorrect for drawing, by Google

This new tool by Google is supercool to check
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1
Omnigraffle 2

Diagramming. Wireframing. Drawing. And a ton more.

Radoslav StankovTech @ Product Hunt / AngelList · Written
The best power tool for drawing shapes. It can import/export from variety of formats. Both Mac/iPad app are great.
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