ePubCrawler 0.2.5 for Mac is available as a free download on our application library. The current installer available for download occupies 3.3 MB on disk. The application lies within Design & Photo Tools, more precisely Viewers & Editors. The actual developer of this free Mac application is Rorohiko.
From the developer:
ePubCrawler takes an InDesign document, and converts it to a collection of XHTML and CSS files. There is also eCanCrusher, which comes with ePubCrawler. You can then drag-drop an EPUB folder onto the eCanCrusher application icon, and it will convert the folder into an .epub file. ePubCrawler is very flexible and can be reconfigured to generate a wide range of possible fixed-layout EPUB variants.
You may want to check out more Mac applications, such as Cuadro or Resize Now, which might be related to ePubCrawler.