Download of Assets Processor 1.1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software is included in Developer Tools.
From the developer:
Assets Processor is a simple tool to process your Xcode image assets. Since that the plugins are no longer working.
1. Scale 3x images to 2x.
2. Scale 3x or 2x images to 1x if needs.
3. Upscale 2x images to 3x if needs.
4. Rename file names with the name specified in the imageset.
5. Show all results of every imageset after processing.
You may want to check out more Mac applications, such as AssetsProcessor, Processing or Asset Catalog Creator, which might be similar to Assets Processor.
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