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Pencil is a free, open source and good prototyping tool. http://pencil.evolus.vn/ http://pencil.evolus.vn/ It works perfectly on Linux, Mac, and Windows. It al

by noobs 14y ago

Pencil is a free, open source and good prototyping tool. http://pencil.evolus.vn/ http://pencil.evolus.vn/ It works perfectly on Linux, Mac, and Windows. It allows you to prototype web apps, iphone apps, and Android apps.