You can download ImageOptim 1.8.8 for Mac from our application library for free. The actual developer of this free Mac application is net.pornel. The program is categorized as Design & Photo Tools.
From the developer:
ImageOptim is an open source application for Mac OS that allows you to load images faster.
You may want to check out more Mac applications, such as Image Tricks, Sweet Home 3D or Posterino, which might be similar to ImageOptim.