Aerate is described as 'Effortlessly compress your images without loss of quality. Aerate offers an industry leading default mode, as well as new fast and extreme presets. Switch between modes quickly using the new compression slider' and is a Image Optimizer in the Photos & Graphics category. There are more than 50 alternatives to Aerate for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and Wordpress. The best alternative is ImageMagick, which is both free and Open Source. Other great apps like Aerate are Caesium Image Compressor (Free, Open Source), RIOT - Radical Image Optimization Tool (Free), FileOptimizer (Free, Open Source) and ImageOptim (Free Personal, Open Source).
ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX.
Caesium Image Compressor lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and multiple image processing at the same time, everyone will be able to reach the best result.
Saving images for web/email/other media with the best compression ratio and quality is a difficult task if you don’t have the right tools. Choosing the right format then choosing the right parameters are the key factors of smaller files.
ImageOptim is excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop). It's useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode to allow better optimization).
Compress and compare images with different codecs, right in your browser. Squoosh is an image compression web app that allows you to dive into the advanced options provided by various image compressors like OxiPNG, MozJPEG and JPEG XL.
Utilities for archiving photos for saving to long term storage or serving over the web. The goals are: use a common, well supported format (JPEG), minimize storage space and cost, identify duplicates / similar photos.