The best alternatives to Aircrate - Tools Directory are Framer, 2015 Design Tools, and Subform. If these 3 options don't work for you, we've listed a few more alternatives below.
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Redefining the compass, the Rotio Compass gives the user greater control over the pen for more accurate and precise line work. The base is stable making it easy to control and is non-marking, avoiding damage to the page so your work remains pristine.