Windows: If you don't want to spend time micro-designing an icon and you've already got a source image, SimplyIcon makes creating your buttons and icons a drag-and-drop matter.
Download the SimplyIcon package, extract the executable and DLL file to a folder, run the program, and you're presented with a simple dialogue box and the instructions to drag and drop an image onto it. Once you drag and drop the image, SimplyIcon creates a variety of icon files in various sizes—up to 128x128 if you source image is large enough.
You won't find any image editing tools or tweaks on SimplyIcon, it accepts whatever image you drag into it and cranks out an icon file. If that's good enough for you, it's definitely a download you'll want to keep stashed in your home folder.
SimplyIcon is free, Windows only, and requires .Net 2.0 Framework or higher. Have a favourite icon creation tool of your own? Share it in the comments.
SimplyIcon [via The How-To Geek]