Downloading DroidAssets 1.1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free Mac app is a product of Ludovic Landry. DroidAssets for Mac belongs to Developer Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
DroidAssets allows you to generate all the assets you need for your Android application in record time. You just need to drag and drop an asset from the res/drawable-{density} folder, and this asset will be generated for all the other densities you need. This works not only for simple PNGs, but also for 9-patches.
You may want to check out more Mac applications, such as JBuddy Bot Builder, HexDecBin or Pleinpot, which might be related to DroidAssets.