Apps similar to Dot Matrix include IcoFX. It's paid, but Iconion and KIconEdit are free. Other options are IconWorkshop. In total there are four Icon Editors like Dot Matrix for Windows, Linux and Mac.
IcoFX is a professional icon and cursor editor designed to work with small images. You can easily create, edit, read and save icons with transparency for Windows XP, Vista and Macintosh. You can convert your favorite images into icons, or icons to images.
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IconWorkshop is a professional tool designed to create, extract, convert, manage and redistribute icons for Windows, Mac OS, iPhone, and Android up to 512x512. No complicated settings, no more pixel-by-pixel icon making.
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Iconion allows you to convert any icon font into fantastic-looking png icons by adding color, shadow, background, gradient, stroke and many other fancy elements.
